CLASS Statement

The GLM Procedure

CLASS Statement

CLASS variables ;

The CLASS statement names the classification variables to be used in the model. Typical class variables are TREATMENT, SEX, RACE, GROUP, and REPLICATION. If you specify the CLASS statement, it must appear before the MODEL statement.

Class levels are determined from up to the first 16 characters of the formatted values of the CLASS variables. Thus, you can use formats to group values into levels. Refer to the discussion of the FORMAT procedure in the SAS Procedures Guide, and the discussions for the FORMAT statement and SAS formats in SAS Language Reference: Dictionary.

The GLM procedure displays a table summarizing the class variables and their levels, and you can use this to check the ordering of levels and, hence, of the corresponding parameters for main effects. If you need to check the ordering of parameters for interaction effects, use the E option in the MODEL, CONTRAST, ESTIMATE, and LSMEANS statements. See the "Parameterization of PROC GLM Models" section for more information.

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