Incorrect output produced for sample selection model when the DIST=LOGISTIC option is specified for the SELECT variable in PROC QLIM


When a logistic distribution is specified for the selection variable in a sample selection model, PROC QLIM fails to print an ERROR indicating the DISCRETE(DIST=LOGISTIC) option is not valid in a sample selection model. Further, PROC QLIM produces incorrect results in this case.

To avoid the problem, specify only DISCRETE(DIST=PROBIT) for the selection variable.