Interval algorithms

The algorithms MINMWMAX and MEDMW create intervals at both sides of the arithmetic mean (AM) according to two different statistical procedures. With MINMWMAX the span between AM and the minimum value and the span between the maximum value and AM are divided by n/2 in order to obtain the numerical limits of the n intervals. With MEDMW the number of polygons located at both sides of AM is divided by n/2. Usually the choropleth profiles created by MINMWMAX are well balanced, whereas the choropleth profiles created by MEDMW have more prominent structures.