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Results tagged with contrasts
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user 268026
In linear models and particularly in ANOVA, a contrast is a linear combination of parameters with coefficients summing up to zero. It is used to test the corresponding null hypothesis. Contrasts are especially often used with categorical predictors (factors) to make comparisons among the groups (categories). [See also tag 'categorical-encoding']
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Validity of setting Singular=1 in proc GLM Contrast statement (SAS)
I am running a proc GLM in SAS with specific contrasts, one of which is included in the code below. … With the following code, all my contrasts are always unestimable:
proc GLM data=my_data;
Class A B C;
Model norm_counts = A|B C(B) A*C(B);
Random C(B) A*C(B) / test;
Contrast 'Female.Obp50Pos …
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