The COUNTREG Procedure

Syntax: COUNTREG Procedure

The COUNTREG procedure is controlled by the following statements:

BOUNDS bound1 < , bound2 …> ;
BY variables ;
CLASS variables ;
FREQ variable ;
INIT initvalue1 <, initvalue2 …> ;
MODEL dependent variable = regressors / options ;
NLOPTIONS options ;
OUTPUT options ;
RESTRICT restriction1 <, restriction2 …> ;
WEIGHT variable ;
ZEROMODEL dependent variable $\sim $ zero-inflated regressors / options ;

There can only be one MODEL statement. The ZEROMODEL statement, if used, must appear after the MODEL statement, and the CLASS statement must precede the MODEL statement. If a FREQ or WEIGHT statement is specified more than once, the variable specified in the first instance is used.