R-value

R-value or rvalue may refer to:

In computer science, an r-value is a pure value which cannot be assigned to
R-value (insulation) in building engineering, the efficiency of insulation of a house
R-value (soils) in geotechnical engineering, the stability of soils and aggregates for pavement construction
R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data
In statistics, the Pearson product-moment correlation coefficient, or simply correlation coefficient
In solid mechanics, the Lankford coefficient
In epidemiology, the Basic reproduction number, the rate at which an infection is thought to spread

See also