Triangle diagram
The triangle diagram is one of the forms of representation of nomograms , ie graphically converted mathematical equations . It is suitable for representing a constant sum that is broken down into three summands . As a rule, it is used when structuring a value of 100% ( complementary characteristics), such as for the age structure (division into the age groups of pre-employment, working and retirement age). Further examples are the division of the economy into the three economic sectors or the land use (settlement area, agricultural and forestry area, unproductive land), the structure of the agricultural area (arable land, meadow land, pasture land) and much more.
One advantage of the triangle diagram is that the development of structural shifts over time and also the structural comparison can be shown very clearly.
For this purpose, parallel sets are drawn to the sides in an equilateral triangle . In this case, it is recommended that either the parallel hosts to draw visible as grid lines into the triangle or draw the tick marks of the scale lines so long, that the construction net inside the triangle is still recognizable.
If the basic axis has its zero point in the lower left corner of the triangle, the lower right corner receives the value 100, and the scale is oriented as a parallel set on the left side of the triangle. The right axis has its origin in the lower right corner, the value 100 in the tip of the triangle, and the value parallels are based on the basic axis. The last value axis is represented by the left side of the triangle. Its zero point lies in the apex of the triangle, the value 100 in the left corner point, and the coordinate lines run parallel to the right side of the triangle.
Web links
- Example of a triangle diagram ( Memento from April 19, 2009 in the Internet Archive )
- Tri-Plot: Creating triangle diagrams in Excel, freeware