Descriptive statistics for each variable are computed separately, based only on the valid values for that variable. Covariances and correlations are based only on complete full rows of the data. After the model is estimated, the sample is once again restored to the master sample. The master sample is 1-10,12. After it is run, the current sample is restored to 1-10,12.
SKIP only controls the sample in model commands.
X X are not controlled by SKIP .