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Details of the FACTEX Procedure |
Examining the alias structure is important since aliased effects cannot be estimated separately from one another. When several effects are listed as equal, the effects are all jointly aliased with one another and form an alias chain or alias string. For example,
By default, the FACTEX procedure displays alias chains with effects up to a certain order d, where main effects are order 1, two-factor interactions are order 2, and so on. The value of d can be specified in the ALIAS option, or you can use the default calculated by the procedure . Alias chains that are confounded with blocks are displayed with [B] on the left-hand side.
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