Because there are two datasets being simultaneously mapped (i.e., states and MMSAs), how do I interpret the legend, and to which dataset are the class breaks assigned?
Class break values are determined for the states’ data and are concurrently applied to the states’ and MMSAs’ data. Therefore, when displayed simultaneously, the class breaks are the same for both states and MMSAs. The exception to this rule is for the last class (e.g., the fifth class in a five-class map): the upper values for each dataset are usually different; therefore, the data range for the last class varies between the states and the MMSAs. However, the lower data value for states and MMSAs in that class are identical. The opposite applies for the first (lowest) data class. In this case, the lower data values usually differ between states and MMSAs; however, the class break point is identical for the upper range of the first class. To use one legend for both states and MMSAs, the values for the first class are indicated as, for example, ” 23.0″ (the upper value of the lowest class). By inference, the lowest values for the states and MMSAs are lower than this stated value, but ar
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