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.