Report the Missing Data for Class Variables with the MISSING Option

Example

Just because your PROC TABULATE code runs without errors and your table looks fine, do not think that there are no problems lurking beneath the surface. Checking your table for missing data problems is an important step in the table production process.
When you have missing data for some or all of the class variables used in your table, PROC TABULATE does not give you any warning messages about the problem. Many SAS procedures produce messages such as: "Warning: 312 observations have missing data, only 57 observations will be used for analysis." PROC TABULATE, however, does not warn you about missing data.
When producing a table, PROC TABULATE first checks every observation ...

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