The OUTEST= data set is has two rows: the first row (with _TYPE_=‘PARM’) contains each of the parameter estimates in the model, and the second row (with _TYPE_=‘STD’) contains the standard errors for the parameter estimates in the model.
If you specify the COVOUT option in the PROC COUNTREG statement, the OUTEST= data set also contains the covariance matrix for the parameter estimates. The covariance matrix appears in the observations for which _TYPE_=‘COV’, and the _NAME_ variable labels the rows with the parameter names.
The names of the parameters are used as variable names. These are the same names that are used in the INIT, BOUNDS, and RESTRICT statements.