Standardized Choropleth Map

This map was taken from http://www.statcan.gc.ca/pub/92f0138m/2008003/figures/5200001-eng.htm

This is a good example of a Standardized Choropleth Map.  The data for this map is no longer just the raw data, but it has been standardized so that it follows a normal distribution.  The reason for this data to be standardized is that the data can then be manipulated and all the normal assumptions will then apply.