The FMM Procedure

The “Number of Observations” table displays the number of observations read from the input data set and the number of observations used in the analysis. If you specify a FREQ statement, the table also displays the sum of frequencies read and used. If the events/trials syntax is used for the response, the table also displays the number of events and trials used in the analysis.

Note that the number of observations “used” in the analysis is not unambiguous in a mixture model. An observation that is “unusable” for one component distribution (because the response value is outside of the support of the distribution) might still be usable in the mixture model when the response value is in the support of another component distribution. You can affect the way in which PROC FMM handles exclusion of observations due to support violations with the EXCLUSION= option in the PROC FMM statement.