Classed Choropleth maps are characterized by areal units combined into a smaller number of groups and portrayed in intervals. This particular map is characterized with five intervals to show the breast cancer rates in white women. By analyzing this map, it appears that there is a high concentration of breast cancer in the north east of the United States and a much lower concentration in the southern states. The four classification techniques of classed cloropleth maps are equal steps, quantiles, natural breaks, and minimum variance. The interval for this map used the classification technique of equal steps.
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