A vital component of maps is their ability to organize data. No where is it more evident than in the use of histograms. As shown in the example above, data is grouped into easily deciphered categories placed into different bars based on height. The independent variable which is normally on the x axis is height, and the dependent variable, frequency in this case, is usually found on the y axis.
http://www.analyzemath.com/statistics/histogram.html
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