The HPGENSELECT Procedure

ZEROMODEL Statement

ZEROMODEL <effects> </ zeromodel-options> ;

The ZEROMODEL statement defines the statistical model for zero inflation probability in terms of model effects that are constructed from variables in the input data set. An intercept term is always included in the model.

You can specify the following zeromodel-options.

INCLUDE=n
INCLUDE=single-effect
INCLUDE=(effects)

forces effects to be included in all models for zero inflation for all selection methods. If you specify INCLUDE=n, then the first n effects that are listed in the ZEROMODEL statement are included in all models. If you specify INCLUDE=single-effect or if you specify a list of effects within parentheses, then the specified effects are forced into all models. The effects that you specify in the INCLUDE= option must be explanatory effects that are specified in the ZEROMODEL statement before the slash (/).