variable named GROUP, and a covariate named X, then the test of equal slopes can be
constructed using PROC GLM. The following statementsconduct this test:
proc glm data=DSN;
class GROUP;
model RESPONSE = X GROUP X*GROUP;
run;
(See the testassociatedwith the X*GROUP component.) In fact, the PROC GLMstep in
Display 5.13 conducts this testwith IDINOas the classification variable. In the previous
statements, adding an ODS Graphics statement produces a figure similar to Display 5.15.
5.3 ANOVA Models▬PROC GLMfor a One-Way ANOVA
In experimental studies, comparing average responses between differe
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