Which SAS statement completes the program to produce the desired PROC MEANS report?

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The desired PROC MEANS report can be efficiently structured by using the CLASS statement. This statement allows for the computation of summary statistics for different groups within a dataset, defined by the class variable specified—in this case, "location." The CLASS statement groups the data by "location" before performing the analysis, enabling PROC MEANS to calculate means, counts, and other statistics separately for each location.

Using the CLASS statement is particularly advantageous because it automatically manages the subsets of the data for analysis and outputs the results in a clear and organized manner without needing additional steps to define how the data should be grouped. This results in a concise report that is easy to interpret.

Other options do not appropriately serve this purpose within the context of PROC MEANS. For instance, "by location" would require a sorted dataset and would not generate the summary statistics in the same streamlined way. The "id location" option doesn’t align with the intended functionality of PROC MEANS, as it does not facilitate summary calculations. The phrase "group by location" is not a valid syntax in the context of SAS. Therefore, the CLASS statement is the most suitable choice for producing the intended PROC MEANS report.

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