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{{Short description|Finnish mathematician and statistician}}
{{Infobox scientist
{{Infobox scientist
|name = Erik Gustav Elfving
| name = Erik Gustav Elfving
|birth_date = {{Birth date|1908|6|25|df=y}}
| birth_date = {{Birth date|1908|6|25|df=y}}
|birth_place = [[Helsinki]], Finland
| birth_place = [[Helsinki]], Finland
|image = Gustav-Elfving.jpg
| image = Gustav-Elfving.jpg
|residence = Finland
| nationality = [[Finland|Finnish]]
⚫
| death_date = {{death date and age|1984|3|25|1908|6|25|df=y}}
|nationality = [[Finland|Finnish]]
⚫
| death_place = Helsinki, Finland
⚫
|death_date = {{death date and age|1984|3|25|1908|6|25|df=y}}
⚫
| field = [[Statistics]], [[Probability theory]]
⚫
|death_place = Helsinki, Finland
| work_institution = [[Helsinki University of Technology]], [[University of Helsinki]]
⚫
|field = [[Statistics]], [[Probability theory]]
|work_institution = [[Helsinki University]]
| alma_mater = [[University of Helsinki]]
⚫
| doctoral_advisor = [[Rolf Nevanlinna]]
|alma_mater = [[Helsinki University]]
⚫
| doctoral_students = [[Pentti Suomela (mathematician)|Pentti Suomela]]<br>[[Elja Arjas]]
⚫
|doctoral_advisor = [[Rolf Nevanlinna]]
⚫
| known_for = Elfving sets, Elfving's theorem in the optimal design of experiments
⚫
|doctoral_students = [[Pentti Suomela]]
⚫
| prizes = Fellow of the [[Institute of Mathematical Statistics]], Elected Member of the [[International Statistical Institute]], Honorary Foreign Member of the [[Royal Swedish Academy of Sciences]]
⚫
|known_for = Elfving sets, Elfving's theorem in the optimal design of experiments
⚫
| footnotes =
⚫
|prizes = Fellow of the [[Institute of Mathematical Statistics]], Elected Member of the [[International Statistical Institute]], Honorary Foreign Member of the [[Royal Swedish Academy of Sciences]]
⚫
|footnotes =
}}
}}
'''Erik Gustav Elfving''' (25 June 1908 – 25 March 1984) was a [[Finland|Finnish]] [[mathematician]] and [[statistician]]. In statistics, he wrote pioneering papers about the [[optimal design]] of [[design of experiments|experiments]]. He made other notable contributions to the [[mathematical sciences]] and to [[list of universities in Finland|Finnish universities]].<ref name="DMNP"/>
'''Erik Gustav Elfving''' (25 June 1908 – 25 March 1984) was a [[Finland|Finnish]] [[mathematician]] and [[statistician]]. He wrote pioneering works in mathematical statistics, especially on the [[design of experiments]].<ref name="DMNP"/>


==Early life==
==Early life==
Erik Gustav Elfving was son of Fredrik Elfving (1854–1942), a professor of botany at the [[University of Helsinki]],<ref name="Puk430"/> and Thyra Elfving (née Ingman).<!-- p. 123 --><ref name="DMNP" /> He was the youngest of four children.<!-- p. 123 --><ref name="DMNP" /> Gustav Elfving earned excellent grades at the Svenska normallyceum, a Helsinki [[Gymnasium (school)#North European countries|gymnasium]] for [[Swedish-speaking Finns|Swedish-speaking]] boys, from which he graduated in 1926.<ref>{{harvtxt|Nordström|1999|p=174}}</ref> In the same year he enrolled at the University of Helsinki, planning to major in astronomy. He switched to mathematics, graduating in 1930 in mathematics, with astronomy and physics as minor subjects. From 1927 to 1929, he worked as a computational assistant at the astronomical observatory of
Erik Gustav Elfving was son of [[Fredrik Elfving]] (1854–1942), a professor of botany at the [[University of Helsinki]],<ref name="Puk430"/> and Thyra Elfving (née Ingman).<!-- p. 123 --><ref name="DMNP" /> He was the youngest of four children.<!-- p. 123 --><ref name="DMNP" /> Gustav Elfving earned excellent grades at the ''[[Svenska normallyceum i Helsingfors]]'', a Helsinki [[Gymnasium (school)#North European countries|gymnasium]] for [[Swedish-speaking Finns|Swedish-speaking]] boys, from which he graduated in 1926.<ref>{{harvtxt|Nordström|1999|p=174}}</ref> In the same year he enrolled at the University of Helsinki, planning to major in astronomy. He switched to mathematics, graduating in 1930 in mathematics, with astronomy and physics as minor subjects. From 1927 to 1929, he worked as a computational assistant at the astronomical observatory of
the University of Helsinki.<ref name="Nord7576" >{{harvtxt|Nordström|1999|pp=175–176}}</ref> He studied [[probability theory]] under [[Jarl Waldemar Lindeberg|J. W. Lindeberg]],<ref name="Puk430"/> who is now known for [[Lindeberg's condition]] for the [[central limit theorem]].<ref>{{cite journal
the University of Helsinki.<ref name="Nord7576" >{{harvtxt|Nordström|1999|pp=175–176}}</ref> He studied [[probability theory]] under [[Jarl Waldemar Lindeberg|J. W. Lindeberg]],<ref name="Puk430"/> who is now known for [[Lindeberg's condition]] for the [[central limit theorem]].<ref>{{cite journal
| author=J. W. Lindeberg
| author=J. W. Lindeberg
| title=Eine neue Herleitung des Exponentialgesetzes in der Wahrscheinlichkeitsrechnung
| title=Eine neue Herleitung des Exponentialgesetzes in der Wahrscheinlichkeitsrechnung
| year=1922
| year=1922 |journal=Mathematische Zeitschrift
| pages=211–225
| pages=211–225 |volume=15
| url=http://www-gdz.sub.uni-goettingen.de/cgi-bin/digbib.cgi?PPN266833020_0015}}</ref><!-- p. 124 --><ref name="DMNP" /> He wrote his (1934) dissertation under the supervision of [[Rolf Nevanlinna]];<ref name="Puk430"/> his thesis studied [[Riemann surfaces]] and their [[Uniformization theorem|uniformization]].<ref name="Nord75">{{harvtxt|Nordström|1999|p=175}}</ref> In the [[value distribution theory of holomorphic functions|Nevanlinna theory]] of the values of [[meromorphic function]]s, Elfving's results were praised by Drasin<!-- 1977, p. 85 -->.<ref name="DMNP"/><ref>{{cite journal | last1 = Drasin | first1 = D | year = 1977 | title = The inverse problem of the Nevanlinna theory | url = | journal = Acta Math. | volume = 138 | issue = | pages = 83–151 | doi=10.1007/bf02392314| doi-access = free }}</ref>
| url=http://www-gdz.sub.uni-goettingen.de/cgi-bin/digbib.cgi?PPN266833020_0015}}</ref><!-- p. 124 --><ref name="DMNP" /> He wrote his (1934) dissertation under the supervision of [[Rolf Nevanlinna]];<ref name="Puk430"/> his thesis studied [[Riemann surfaces]] and their [[Uniformization theorem|uniformization]].<ref name="Nord75">{{harvtxt|Nordström|1999|p=175}}</ref> In the [[value distribution theory of holomorphic functions|Nevanlinna theory]] of the values of [[meromorphic function]]s, Elfving's results were praised by Drasin<!-- 1977, p. 85 -->.<ref name="DMNP"/><ref>{{cite journal | last1 = Drasin | first1 = D | year = 1977 | title = The inverse problem of the Nevanlinna theory | journal = Acta Math. | volume = 138 | pages = 83–151 | doi=10.1007/bf02392314| doi-access = free }}</ref>


=== Fiancée's death and his 1935 expedition to Greenland ===
=== Fiancée's death and his 1935 expedition to Greenland ===
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===Optimal design of experiments===
===Optimal design of experiments===
In statistics, Elfving is known as one of the founders of the modern theory of the [[optimal design of experiments]].<ref name="DMNP">{{harvtxt|Draper|Mäkeläinen|Nordström|Pukelsheim|1999}}</ref><ref name="Puk430">{{harvtxt|Pukelsheim|2006|loc=Appendix of Biographies 2 Gustav Elfving 1908–1984, p. 430}}</ref><ref name="Fellman">{{harvtxt|Fellman|1999}}</ref> While accompanying a surveying expedition to western Greenland, extended and intense rains left Elving with three days in his tent, during which time he consider the best locations of observations to estimate parameters on linear models.<ref name="Puk430"/><ref name="Nord76"/><ref name="Fellman"/> Elfving's ideas appeared in his paper on the optimal design of experiments for estimating linear models. This paper also introduced concepts from [[convex geometry]], including "Elfving sets"<ref>{{harvtxt|Pukelsheim|1999|pp=43–44, 107, 134, 191, 231, 420}}</ref> and Elfving's theorem.<ref>{{harvtxt|Pukelsheim|1999|pp=50, 107, 182, 190, 198, 212, 231, 239, 259, 410, 422}}</ref><ref>Studden, W. J. Elfving's theorem and optimal designs for quadratic loss. ''Ann. Math. Statist.'' ''' 42 ''' (1971), 1613–1621. {{MR|341771}}</ref> Being symmetric, ''Elfving sets'' are formed by the [[union (mathematics)|union]] of a set and its reflection through the origin, −''S''&nbsp;∪&nbsp;''S''.<ref>{{harvtxt|Pukelsheim|1999|pp=43–44}}</ref><ref>
In statistics, Elfving is known as one of the founders of the modern theory of the [[optimal design of experiments]].<ref name="DMNP">{{harvtxt|Draper|Mäkeläinen|Nordström|Pukelsheim|1999}}</ref><ref name="Puk430">{{harvtxt|Pukelsheim|2006|loc=Appendix of Biographies 2 Gustav Elfving 1908–1984, p. 430}}</ref><ref name="Fellman">{{harvtxt|Fellman|1999}}</ref> While accompanying a surveying expedition to western Greenland, extended and intense rains left Elving with three days in his tent, during which time he considered the best locations of observations to estimate parameters of linear models.<ref name="Puk430"/><ref name="Nord76"/><ref name="Fellman"/> Elfving's ideas appeared in his paper on the optimal design of experiments for estimating linear models. This paper also introduced concepts from [[convex geometry]], including "Elfving sets"<ref>{{harvtxt|Pukelsheim|2006|pp=43–44, 107, 134, 191, 231, 420}}</ref> and Elfving's theorem.<ref>{{harvtxt|Pukelsheim|2006|pp=50, 107, 182, 190, 198, 212, 231, 239, 259, 410, 422}}</ref><ref>Studden, W. J. Elfving's theorem and optimal designs for quadratic loss. ''Ann. Math. Statist.'' ''' 42 ''' (1971), 1613–1621. {{MR|341771}}</ref> Being symmetric, ''Elfving sets'' are formed by the [[union (mathematics)|union]] of a set and its reflection through the origin, −''S''&nbsp;∪&nbsp;''S''.<ref>{{harvtxt|Pukelsheim|2006|pp=43–44}}</ref><ref>
* Elfving, G. (1953). Convex sets in statistics. In ''Tolfte Skandinaviska Matematikerkongressen'', Lund, August 10–15, 1953, 34–39.
* Elfving, G. (1953). Convex sets in statistics. In ''Tolfte Skandinaviska Matematikerkongressen'', Lund, August 10–15, 1953, 34–39.
* {{cite journal | last1 = Elfving | first1 = G | year = 1954b | title = Geometric allocation theory | url = | journal = Skandinavisk Aktuarietidskrift | volume = 37 | issue = | pages = 170–190 }}
* {{cite journal | last1 = Elfving | first1 = G | year = 1954b | title = Geometric allocation theory | journal = Skandinavisk Aktuarietidskrift | volume = 37 | pages = 170–190 }}
* {{cite journal | last1 = Elfving | first1 = G | year = 1957a | title = A selection problem in experimental design | url = | journal = Societas Scientiarum Fennica Commentationes Physico-Mathematicae | volume = 20 | issue = 2| pages = 3–10 }}
* {{cite journal | last1 = Elfving | first1 = G | year = 1957a | title = A selection problem in experimental design | journal = Societas Scientiarum Fennica Commentationes Physico-Mathematicae | volume = 20 | issue = 2| pages = 3–10 }}
* Elfving, G. (1957b). Minimax character of balanced experimental designs. In ''XIII Congr. Math. Scand.'' 69–76.
* Elfving, G. (1957b). Minimax character of balanced experimental designs. In ''XIII Congr. Math. Scand.'' 69–76.
</ref><ref>{{harvtxt|Fellman|1999|pp=198–199}}</ref> According to {{harvtxt|Chernoff|1999|p=204}}, Elfving was generous in crediting others' results: His paper in the [[Harald Cramér|Cramér]]-[[festschrift]] acknowledged unpublished notes of [[Leonard Jimmie Savage|L. J. Savage]]; Elfving was a referee for the fundamental paper on optimal designs by [[Jack Carl Kiefer|Kiefer]] and [[Jacob Wolfowitz|Wolfowitz]].<ref name="Chernoff204">{{harvtxt|Chernoff|1999|p=204}}</ref><ref name="KW">Kiefer, J.; Wolfowitz, J. Optimum designs in regression problems. ''Ann. Math. Statist.'' ''' 30 ''' 1959 271–294. {{MR|104324}}</ref>
</ref><ref>{{harvtxt|Fellman|1999|pp=198–199}}</ref> According to {{harvtxt|Chernoff|1999|p=204}}, Elfving was generous in crediting others' results: His paper in the [[Harald Cramér|Cramér]]-[[festschrift]] acknowledged unpublished notes of [[Leonard Jimmie Savage|L. J. Savage]]; Elfving was a referee for the fundamental paper on optimal designs by [[Jack Carl Kiefer|Kiefer]] and [[Jacob Wolfowitz|Wolfowitz]].<ref name="Chernoff204">{{harvtxt|Chernoff|1999|p=204}}</ref><ref name="KW">Kiefer, J.; Wolfowitz, J. Optimum designs in regression problems. ''Ann. Math. Statist.'' ''' 30 ''' 1959 271–294. {{MR|104324}}</ref>
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Elfving made notable contributions in many fields. In mathematics, he did research in [[complex analysis]] and probability theory (particularly [[Markov process|Markov]] and [[point process]]es). In statistical theory, his most influential work was in optimal design, but he also worked in [[Statistical sampling|sampling theory]],<ref>
Elfving made notable contributions in many fields. In mathematics, he did research in [[complex analysis]] and probability theory (particularly [[Markov process|Markov]] and [[point process]]es). In statistical theory, his most influential work was in optimal design, but he also worked in [[Statistical sampling|sampling theory]],<ref>
* Elfving, G. (1954a). A unified approach to the allocation problem in sampling theory. Abstract from ''Proc. Inter. Math. Congr.'', Amsterdam, Sept. 1954.
* Elfving, G. (1954a). A unified approach to the allocation problem in sampling theory. Abstract from ''Proc. Inter. Math. Congr.'', Amsterdam, Sept. 1954.
* {{cite journal | last1 = Elfving | first1 = G | year = 1954b | title = Geometric allocation theory | url = | journal = Skandinavisk Aktuarietidskrift | volume = 37 | issue = | pages = 170–190 }}
* {{cite journal | last1 = Elfving | first1 = G | year = 1954b | title = Geometric allocation theory | journal = Skandinavisk Aktuarietidskrift | volume = 37 | pages = 170–190 }}
* Elfving, G. (1956). Selection of nonrepeatable observations for estimation. ''Proc. Third Berkeley Symp. Math. Statist. Probab'' volume '''1''' pp. 69–75. Univ. California Press, Berkeley.</ref>
* Elfving, G. (1956). Selection of nonrepeatable observations for estimation. ''Proc. Third Berkeley Symp. Math. Statist. Probab'' volume '''1''' pp. 69–75. Univ. California Press, Berkeley.</ref>
[[psychometrics]], [[applied statistics]], and the [[decision science]]s (including [[decision theory]], [[game theory]], and [[Bayesian statistics]]). He also contributed to [[mathematics education]] by writing textbooks, book reviews, and [[popular science]]. He wrote papers and a book on the [[history of mathematics]].<ref name="DMNP"/>
[[psychometrics]], [[applied statistics]], and the [[decision science]]s (including [[decision theory]], [[game theory]], and [[Bayesian statistics]]). He also contributed to [[mathematics education]] by writing textbooks, book reviews, and [[popular science]]. He wrote papers and a book on the [[history of mathematics]].<ref name="DMNP"/>
Line 58: Line 58:
==Academic and scientific offices==
==Academic and scientific offices==
[[File:Unioninkatu 34.jpg|thumb|right|alt=University of Helsinki (Main Building)|Elfving graduated from the University of Helsinki.]]
[[File:Unioninkatu 34.jpg|thumb|right|alt=University of Helsinki (Main Building)|Elfving graduated from the University of Helsinki.]]
During 1938–1945, Elfving worked as a lecturer at the [[Helsinki University of Technology]].
Elfving became the Professor of Mathematics at the [[Helsinki University of Technology]] succeeding [[Lars Ahlfors]], who had moved to Harvard University. During the academic year 1946–1947, Elfving served as ''locum tenens'' professor at Stockholm University. Elfving visited [[William Feller]] at [[Cornell University]] in 1949 and 1950. He was an invited plenary speaker at the Third Berkeley Symposium on Probability and Mathematical Statistics in 1955. That same year, he visited Columbia University in the Spring, at the invitation of [[Theodore W. Anderson]], [[Herbert Robbins]], and [[Herbert Solomon]]. He visited Solomon again at Stanford University during the fall of 1960 and the spring of 1966.<!-- pp. 124-125 --><ref name="DMNP" />
During the academic year 1946–1947, Elfving served as ''locum tenens'' professor at Stockholm University. In 1948 Elfving became a Professor of Mathematics at the [[University of Helsinki]] succeeding [[Lars Ahlfors]], who had moved to Harvard University. Elfving visited [[William Feller]] at [[Cornell University]] in 1949 and 1950. He was an invited plenary speaker at the Third Berkeley Symposium on Probability and Mathematical Statistics in 1955. That same year, he visited Columbia University in the Spring, at the invitation of [[Theodore W. Anderson]], [[Herbert Robbins]], and [[Herbert Solomon]]. He visited Solomon again at Stanford University during the fall of 1960 and the spring of 1966.<!-- pp. 124-125 --><ref name="DMNP" />


He was elected as a fellow of the [[Institute of Mathematical Statistics]] in 1955 and an elected member of the [[International Statistical Institute]] in 1963. Elfving was elected <!-- on 10 April -->as a foreign member of the [[Swedish Academy of Sciences]] in 1974, the same year that he was elected to the [[Royal Statistical Society]].<ref name=Nord82>{{harvtxt|Nordström|1999|p=182}}</ref> He served on the editorial boards of three international journals: ''[[Probability Theory and Related Fields]]'' (1962–1975), ''[[Annals of Mathematical Statistics|The Annals of Mathematical Statistics]]'' (1964–1967), and ''[[Mathematica Scandinavica]]'' (1953–1972).<!-- p. 125-126 --><ref name=" DMNP"/> Elfving had a deep sense of honor and propriety: When he resigned from the editorial boards following decades of service, he requested that he not be sent complimentary issues of the journals; when he failed to accomplish high levels of research, he offered to return the funding to the granting agency.<ref name="Nord82"/>
He was elected as a fellow of the [[Institute of Mathematical Statistics]] in 1955 and an elected member of the [[International Statistical Institute]] in 1963. Elfving was elected <!-- on 10 April -->as a foreign member of the [[Swedish Academy of Sciences]] in 1974, the same year that he was elected to the [[Royal Statistical Society]].<ref name=Nord82>{{harvtxt|Nordström|1999|p=182}}</ref> He served on the editorial boards of three international journals: ''[[Probability Theory and Related Fields]]'' (1962–1975), ''[[Annals of Mathematical Statistics|The Annals of Mathematical Statistics]]'' (1964–1967), and ''[[Mathematica Scandinavica]]'' (1953–1972).<!-- p. 125-126 --><ref name=" DMNP"/> Elfving had a deep sense of honor and propriety: When he resigned from the editorial boards following decades of service, he requested that he not be sent complimentary issues of the journals; when he failed to accomplish high levels of research, he offered to return the funding to the granting agency.<ref name="Nord82"/>
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==Bibliography==
==Bibliography==


* {{cite journal|last=Elfving|first=G.|<!-- authorlink=Gustav Elfving -->|title=Optimum allocation in linear regression theory|journal=Annals of Mathematical Statistics|volume=23|issue=2|year=1952|pages=255–262|mr=47998|ref=harv|doi=10.1214/aoms/1177729442|doi-access=free}}
* {{cite journal|last=Elfving|first=G. <!-- authorlink=Gustav Elfving -->|title=Optimum allocation in linear regression theory|journal=Annals of Mathematical Statistics|volume=23|issue=2|year=1952|pages=255–262|mr=47998|doi=10.1214/aoms/1177729442|doi-access=free}}
* {{cite book|last=Elfving|first=G.|<!-- authorlink=Gustav Elfving -->|chapter=Design of linear experiments|year=1959|title=Probability and statistics: The Harald Cramér volume|editor-first=Ulf|editor-last=Grenander|editor-link=Ulf Grenander|pages=58–74|publisher=Almqvist & Wiksell, Stockholm; John Wiley & Sons, New York|mr=111106|ref=harv}}
* {{cite book|last=Elfving|first=G. <!-- authorlink=Gustav Elfving -->|chapter=Design of linear experiments|year=1959|title=Probability and statistics: The Harald Cramér volume|editor-first=Ulf|editor-last=Grenander|editor-link=Ulf Grenander|pages=58–74|publisher=Almqvist & Wiksell, Stockholm; John Wiley & Sons, New York|mr=111106}}
* {{cite book|first=Gustav|last=Elfving|<!-- authorlink=Gustav Elfving -->|year=1981|title=The history of mathematics in Finland 1828–1918|publisher=Societas Scientarium Fennica|location=Helsinki|mr=|ref=harv}}
* {{cite book|first=Gustav|last=Elfving <!-- authorlink=Gustav Elfving -->|year=1981|title=The history of mathematics in Finland 1828–1918|publisher=Societas Scientarium Fennica|location=Helsinki}}


==Notes==
==Notes==
{{Reflist}}
<references/>


==References==
==References==
* {{cite journal|first=Herman|last=Chernoff|authorlink=Herman Chernoff|title=Gustav Elfving's impact on experimental design|journal=Statistical Science|volume=14|issue=2|date=May 1999|pages=197–200|mr=1722069|ref=harv|doi=10.1214/ss/1009212246|jstor=2676739|url=http://projecteuclid.org/euclid.ss/1009212246|id={{Euclid|euclid.ss/1009212246}}|doi-access=free}}
* {{cite journal|first=Herman|last=Chernoff|author-link=Herman Chernoff|title=Gustav Elfving's impact on experimental design|journal=Statistical Science|volume=14|issue=2|date=May 1999|pages=197–200|mr=1722069|doi=10.1214/ss/1009212246|jstor=2676739|url=http://projecteuclid.org/euclid.ss/1009212246|id={{Project Euclid|euclid.ss/1009212246}}|doi-access=free}}
* {{cite book|last1=Draper|first1=Norman R.|last2=Mäkeläinen|first2=Timo|last3=Nordström|first3=Kenneth|last4=Pukelsheim|first4=Friedrich|chapter=Gustav Elfving: An appreciation|editor-first=Juha|editor-last=Alho|title=Statistics, registries, and science: Experiences from Finland|publisher=[[Statistics Finland]]|year=1999|isbn=978-951-727-643-6|pages=123–152|ref=harv}}
* {{cite book|last1=Draper|first1=Norman R.|last2=Mäkeläinen|first2=Timo|last3=Nordström|first3=Kenneth|last4=Pukelsheim|first4=Friedrich|chapter=Gustav Elfving: An appreciation|editor-first=Juha|editor-last=Alho|title=Statistics, registries, and science: Experiences from Finland|publisher=[[Statistics Finland]]|year=1999|isbn=978-951-727-643-6|pages=123–152}}
* {{cite journal|first=J.|last=Fellman|date=May 1999|title=Gustav Elfving's contribution to the emergence of the optimal experimental design theory|journal=Statistical Science|volume=14|issue=2|pages=197–200|mr=1722070|ref=harv|doi=10.1214/ss/1009212245|url=http://projecteuclid.org/euclid.ss/1009212245|<!-- zbl=-->|jstor=2676738|id={{Euclid|euclid.ss/1009212245}}|doi-access=free}}
* {{cite journal|first=J.|last=Fellman|date=May 1999|title=Gustav Elfving's contribution to the emergence of the optimal experimental design theory|journal=Statistical Science|volume=14|issue=2|pages=197–200|mr=1722070|doi=10.1214/ss/1009212245|url=http://projecteuclid.org/euclid.ss/1009212245 <!-- zbl=-->|jstor=2676738|id={{Project Euclid|euclid.ss/1009212245}}|doi-access=free}}
* {{cite journal | last1 = Mäkeläinen | first1 = T | year = 1984 | title = Gustav Elfving | url = | journal = Arkhimedes | volume = 36 | issue = | pages = 201–208 }}
* {{cite journal | last1 = Mäkeläinen | first1 = T | year = 1984 | title = Gustav Elfving | journal = Arkhimedes | volume = 36 | pages = 201–208 }}
* Mäkeläinen, T. (1997). Elfving, Gustav. In ''Leading Personalities in Statistical Sciences: From the Seventeenth Century to the Present'' (N. L. Johnson and S. Kotz, eds.) 96–98. Wiley-Interscience, New York.
* Mäkeläinen, T. (1997). Elfving, Gustav. In ''Leading Personalities in Statistical Sciences: From the Seventeenth Century to the Present'' (N. L. Johnson and S. Kotz, eds.) 96–98. Wiley-Interscience, New York.
* {{cite journal|<!-- authorlink=Kenneth Nordström -->|first=Kenneth|last=Nordström|date=May 1999|title=The life and work of Gustav Elfving|journal=Statistical Science|volume=14|issue=2|pages=174–196|mr=1722074|ref=harv|doi=10.1214/ss/1009212244|url=http://projecteuclid.org/euclid.ss/1009212244|zbl=1059.01541|jstor=2676737|id={{Euclid|euclid.ss/1009212244}}|doi-access=free}}
* {{cite journal <!-- authorlink=Kenneth Nordström -->|first=Kenneth|last=Nordström|date=May 1999|title=The life and work of Gustav Elfving|journal=Statistical Science|volume=14|issue=2|pages=174–196|mr=1722074|doi=10.1214/ss/1009212244|url=http://projecteuclid.org/euclid.ss/1009212244|zbl=1059.01541|jstor=2676737|id={{Project Euclid|euclid.ss/1009212244}}|doi-access=free}}
* {{cite book |author=[http://www.math.uni-augsburg.de/stochastik/pukelsheim/ Pukelsheim, Friedrich] |title=Optimal Design of Experiments |url=https://books.google.com/books?id=5ZcfDZUJ4F8C |<!-- chapter=Appendix:Biographies 2 Gustav Elfving 1908–1984 (p. 430) -->|publisher=[[Society for Industrial and Applied Mathematics]] | series=[http://www.siam.org/books/series/cl.php Classics in Applied Mathematics]| volume=50|year=2006 | edition=republication with errata-list and new preface of Wiley (0-471-61971-X) 1993| pages=454+xxxii|isbn=978-0-89871-604-7}}
* {{cite book |last=Pukelsheim |first=Friedrich |title=Optimal Design of Experiments |url=https://books.google.com/books?id=5ZcfDZUJ4F8C <!-- chapter=Appendix:Biographies 2 Gustav Elfving 1908–1984 (p. 430) -->|publisher=[[Society for Industrial and Applied Mathematics]]| volume=50|year=2006 | edition=republication with errata-list and new preface of Wiley (0-471-61971-X) 1993| pages=454+xxxii|isbn=978-0-89871-604-7}} [http://www.siam.org/books/series/cl.php Classics in Applied Mathematics]


==External links==
==External links==
*[http://www.york.ac.uk/depts/maths/histstat/people/elfving.gif Photograph of Elfving] on the [http://www.york.ac.uk/depts/maths/histstat/people/welcome.htm Portraits of Statisticians] page.
*[http://www.york.ac.uk/depts/maths/histstat/people/elfving.gif Photograph of Elfving] on the [http://www.york.ac.uk/depts/maths/histstat/people/welcome.htm Portraits of Statisticians] page.
* {{MathGenealogy|id=20422}}
* {{MathGenealogy|id=20422}}
* {{Cite web|url=http://www.ams.org/mathscinet/search/author.html?mrauthid=62815|title=Gustav Elfving|author=[[Mathematical Reviews]]|accessdate=2011-04-28}}
* {{Cite web|url=https://www.ams.org/mathscinet/search/author.html?mrauthid=62815|title=Gustav Elfving|author=Mathematical Reviews|author-link=Mathematical Reviews|access-date=2011-04-28}}


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Latest revision as of 08:17, 29 June 2023

Erik Gustav Elfving
Born(1908-06-25)25 June 1908
Helsinki, Finland
Died25 March 1984(1984-03-25) (aged 75)
Helsinki, Finland
NationalityFinnish
Alma materUniversity of Helsinki
Known forElfving sets, Elfving's theorem in the optimal design of experiments
AwardsFellow of the Institute of Mathematical Statistics, Elected Member of the International Statistical Institute, Honorary Foreign Member of the Royal Swedish Academy of Sciences
Scientific career
FieldsStatistics, Probability theory
InstitutionsHelsinki University of Technology, University of Helsinki
Doctoral advisorRolf Nevanlinna
Doctoral studentsPentti Suomela
Elja Arjas

Erik Gustav Elfving (25 June 1908 – 25 March 1984) was a Finnish mathematician and statistician. He wrote pioneering works in mathematical statistics, especially on the design of experiments.[1]

Early life[edit]

Erik Gustav Elfving was son of Fredrik Elfving (1854–1942), a professor of botany at the University of Helsinki,[2] and Thyra Elfving (née Ingman).[1] He was the youngest of four children.[1] Gustav Elfving earned excellent grades at the Svenska normallyceum i Helsingfors, a Helsinki gymnasium for Swedish-speaking boys, from which he graduated in 1926.[3] In the same year he enrolled at the University of Helsinki, planning to major in astronomy. He switched to mathematics, graduating in 1930 in mathematics, with astronomy and physics as minor subjects. From 1927 to 1929, he worked as a computational assistant at the astronomical observatory of the University of Helsinki.[4] He studied probability theory under J. W. Lindeberg,[2] who is now known for Lindeberg's condition for the central limit theorem.[5][1] He wrote his (1934) dissertation under the supervision of Rolf Nevanlinna;[2] his thesis studied Riemann surfaces and their uniformization.[6] In the Nevanlinna theory of the values of meromorphic functions, Elfving's results were praised by Drasin.[1][7]

Fiancée's death and his 1935 expedition to Greenland[edit]

Elfving was engaged to a young woman, who died in 1935, probably from tuberculosis. The grieving parents of his fiancée helped Elfving contact the Danish Geodetic Institute, which hired him as the mathematician for a cartographic expedition to Western Greenland in the summer of 1935.[6] Elfving was photographed while he made theodolite measurements and peered from a tent.[4] Heavy rains forced the expedition to remain sheltered in their tents for three days, during which Elfving started to think about the best locations to take measurements for least squares estimation.[8]

Statistical research[edit]

Picture of a man taking measurements with a theobolite in a frozen environment.
Gustav Elfving invented the optimal design of experiments, and so minimized surveyors' need for theodolite measurements (pictured), while trapped in his tent in storm-ridden Greenland.[8]

In statistics, Elfving did research in the design of experiments, probability theory, and statistical inference, as well as applications.

Optimal design of experiments[edit]

In statistics, Elfving is known as one of the founders of the modern theory of the optimal design of experiments.[1][2][9] While accompanying a surveying expedition to western Greenland, extended and intense rains left Elving with three days in his tent, during which time he considered the best locations of observations to estimate parameters of linear models.[2][8][9] Elfving's ideas appeared in his paper on the optimal design of experiments for estimating linear models. This paper also introduced concepts from convex geometry, including "Elfving sets"[10] and Elfving's theorem.[11][12] Being symmetric, Elfving sets are formed by the union of a set and its reflection through the origin, −S ∪ S.[13][14][15] According to Chernoff (1999, p. 204), Elfving was generous in crediting others' results: His paper in the Cramér-festschrift acknowledged unpublished notes of L. J. Savage; Elfving was a referee for the fundamental paper on optimal designs by Kiefer and Wolfowitz.[16][17]

Other statistical contributions[edit]

As a Professor at the University of Helsinki, Elfving was responsible for writing Finnish language texts, which were used for decades. In his texts and reviews, Elfving emphasized the decision-theoretic foundations of statistics, following Neyman, Pearson, and Wald, and recognized the value of Bayesian methods in statistics and also in operations research.[18] Elfving introduced the statistical symbol for probabilistic independence ⊥⊥, which is a stronger condition than orthogonality ⊥, by the 1950s.[19]

Elfving made notable contributions in many fields. In mathematics, he did research in complex analysis and probability theory (particularly Markov and point processes). In statistical theory, his most influential work was in optimal design, but he also worked in sampling theory,[20] psychometrics, applied statistics, and the decision sciences (including decision theory, game theory, and Bayesian statistics). He also contributed to mathematics education by writing textbooks, book reviews, and popular science. He wrote papers and a book on the history of mathematics.[1]

Students[edit]

He also supervised many students. Elja Arjas is known for his work on inference on stochastic processes and reliability theory, as well as for his supervision of Esa Nummelin and Hannu Oja.[21] Johann Fellman has studied optimal designs for nonsingular or nondifferentiable information functions as well economic theory, and genetics (particularly the frequency of twin births) and for his supervision of Kenneth Nordström and Katarina Juselius.[22][23]

Academic and scientific offices[edit]

University of Helsinki (Main Building)
Elfving graduated from the University of Helsinki.

During 1938–1945, Elfving worked as a lecturer at the Helsinki University of Technology. During the academic year 1946–1947, Elfving served as locum tenens professor at Stockholm University. In 1948 Elfving became a Professor of Mathematics at the University of Helsinki succeeding Lars Ahlfors, who had moved to Harvard University. Elfving visited William Feller at Cornell University in 1949 and 1950. He was an invited plenary speaker at the Third Berkeley Symposium on Probability and Mathematical Statistics in 1955. That same year, he visited Columbia University in the Spring, at the invitation of Theodore W. Anderson, Herbert Robbins, and Herbert Solomon. He visited Solomon again at Stanford University during the fall of 1960 and the spring of 1966.[1]

He was elected as a fellow of the Institute of Mathematical Statistics in 1955 and an elected member of the International Statistical Institute in 1963. Elfving was elected as a foreign member of the Swedish Academy of Sciences in 1974, the same year that he was elected to the Royal Statistical Society.[24] He served on the editorial boards of three international journals: Probability Theory and Related Fields (1962–1975), The Annals of Mathematical Statistics (1964–1967), and Mathematica Scandinavica (1953–1972).[1] Elfving had a deep sense of honor and propriety: When he resigned from the editorial boards following decades of service, he requested that he not be sent complimentary issues of the journals; when he failed to accomplish high levels of research, he offered to return the funding to the granting agency.[24]

At the University of Helsinki from 1964 to 1975, Elfving acted as the "inspector" of the Åbo Nation, a Swedish-speaking "nation" at the University of Helsinki.[19] In Finnish and Swedish universities, "nations" are student associations with similarities to fraternities or cooperatives; the inspector is a highly respected university officer, usually a senior professor, who officiates and delivers addresses at formal functions.

Bibliography[edit]

  • Elfving, G. (1952). "Optimum allocation in linear regression theory". Annals of Mathematical Statistics. 23 (2): 255–262. doi:10.1214/aoms/1177729442. MR 0047998.
  • Elfving, G. (1959). "Design of linear experiments". In Grenander, Ulf (ed.). Probability and statistics: The Harald Cramér volume. Almqvist & Wiksell, Stockholm; John Wiley & Sons, New York. pp. 58–74. MR 0111106.
  • Elfving, Gustav (1981). The history of mathematics in Finland 1828–1918. Helsinki: Societas Scientarium Fennica.

Notes[edit]

  1. ^ a b c d e f g h i Draper et al. (1999)
  2. ^ a b c d e Pukelsheim (2006, Appendix of Biographies 2 Gustav Elfving 1908–1984, p. 430)
  3. ^ Nordström (1999, p. 174)
  4. ^ a b Nordström (1999, pp. 175–176)
  5. ^ J. W. Lindeberg (1922). "Eine neue Herleitung des Exponentialgesetzes in der Wahrscheinlichkeitsrechnung". Mathematische Zeitschrift. 15: 211–225.
  6. ^ a b Nordström (1999, p. 175)
  7. ^ Drasin, D (1977). "The inverse problem of the Nevanlinna theory". Acta Math. 138: 83–151. doi:10.1007/bf02392314.
  8. ^ a b c Nordström (1999, p. 176)
  9. ^ a b Fellman (1999)
  10. ^ Pukelsheim (2006, pp. 43–44, 107, 134, 191, 231, 420)
  11. ^ Pukelsheim (2006, pp. 50, 107, 182, 190, 198, 212, 231, 239, 259, 410, 422)
  12. ^ Studden, W. J. Elfving's theorem and optimal designs for quadratic loss. Ann. Math. Statist. 42 (1971), 1613–1621. MR341771
  13. ^ Pukelsheim (2006, pp. 43–44)
  14. ^
    • Elfving, G. (1953). Convex sets in statistics. In Tolfte Skandinaviska Matematikerkongressen, Lund, August 10–15, 1953, 34–39.
    • Elfving, G (1954b). "Geometric allocation theory". Skandinavisk Aktuarietidskrift. 37: 170–190.
    • Elfving, G (1957a). "A selection problem in experimental design". Societas Scientiarum Fennica Commentationes Physico-Mathematicae. 20 (2): 3–10.
    • Elfving, G. (1957b). Minimax character of balanced experimental designs. In XIII Congr. Math. Scand. 69–76.
  15. ^ Fellman (1999, pp. 198–199)
  16. ^ Chernoff (1999, p. 204)
  17. ^ Kiefer, J.; Wolfowitz, J. Optimum designs in regression problems. Ann. Math. Statist. 30 1959 271–294. MR104324
  18. ^ Elfving, G. (1957b). Minimax character of balanced experimental designs. In XIII Congr. Math. Scand. 69–76.
  19. ^ a b Nordström (1999, p. 177)
  20. ^
    • Elfving, G. (1954a). A unified approach to the allocation problem in sampling theory. Abstract from Proc. Inter. Math. Congr., Amsterdam, Sept. 1954.
    • Elfving, G (1954b). "Geometric allocation theory". Skandinavisk Aktuarietidskrift. 37: 170–190.
    • Elfving, G. (1956). Selection of nonrepeatable observations for estimation. Proc. Third Berkeley Symp. Math. Statist. Probab volume 1 pp. 69–75. Univ. California Press, Berkeley.
  21. ^ Gustav Elfving at the Mathematics Genealogy Project
  22. ^ Rosenqvist, G., Juselius, K., Nordström, K. and Palmgren, J. (eds.) "A Spectrum of Statistical Thought. Essays in Statistical Theory, Economics and Population Genetics in Honour of Johan Fellman", Publications of the Swedish School of Economics and Business Administration, 46, 1991
  23. ^ Gustav Elfving at the Mathematics Genealogy Project
  24. ^ a b Nordström (1999, p. 182)

References[edit]

External links[edit]

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