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Details of the FACTEX Procedure |
The FACTEX procedure accepts models that contain terms for main effects and interactions. Main effects are specified by writing variable names by themselves.
model estimate=(a b c a*b a*c b*c a*b*c);
and
model estimate=(a|b|c);
When the bar (|) is used, the right- and left-hand sides become effects, and their cross becomes an interaction effect. Multiple bars are permitted. The expressions are expanded from left to right, using rules given by Searle (1971). For example, A|B|C is evaluated as follows:
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