Use this field to specify effects by which to model the mean of the response variable.
This option is available only when the Response Type is an incidence density.
Note: Do not specify the treatment variable as it is automatically included.
Observe the following conventions in this field:
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Separate the effects with spaces.
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Use an asterisk (*) to create interactions. For example, assuming A and B are listed as Class Variables, specifying A B A*B constructs a two-way ANOVA model.
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Use a vertical bar (|) to create main effects and interactions. For example, A|B|C is the same as A B A*B C A*C B*C A*B*C.
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Use an at-sign (@) following the use of vertical bars to remove interaction terms. For example, A|B|C@2 removes the three-way interaction term from A|B|C.
To Specify Fixed Effects:
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Make sure that either Incidence density based on first event only or Incidence density based on all events is selected as the Response Type.
