Unformatted text preview: /* expression to include the interaction term AND main effects */ model TS_Expression=Ethnicity|Stage; output out=outa r=resid p=yhat; proc plot; plot resid*yhat; run; Look at interaction plots in Minitab (these are found under Stat>ANOVA , rather than Graph); be sure to vary the input order of the two factors and comment on what you learned from the two diﬀerent sets of plots. In reality, this data set was badly balanced with one empty cell and reaching deﬁnitive conclusions was quite diﬃcult. 1...
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- Spring '08
- Cancer staging, Two-factor Completely Randomized, class Ethnicity Stage