I open my second challenge problem. Yes, we can make the SAS proc; such as FREQ or TABULATE, to make the distribution. For example, here is a table as attached. Yes, it is easy to make the frequency distribution by the State, County, or other administration units in this table. Then, by compare the number of observations, we can find the unit; such as State, with the highest density. What if you want to find the 2 sq miles; any, with the highest density by using the table, how you get it? Thanks for your interests, Dow
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