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Categorical Data Analysis Using The SAS® System, 2nd Edition by Gary G. Koch, Charles S. Davis, Maura E. Stokes

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13.3. Using PROC CATMOD for Weighted Least Squares Analysis

Since the CATMOD procedure is very general, it offers great flexibility in its input. Standard uses that take advantage of defaults may require no more than three or four statements. More statements are required if you take advantage of the facilities for repeated measurements analysis or loglinear model analysis. And the input can be quite rich if you choose to create your own response functions through the specification of the appropriate matrix operations or create your own parameterization by directly inputting your model matrix.

The analysis for the colds data requires minimal input. You need to specify the input data set, the WEIGHT variable if the data are in count form, the ...

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