Missing values in SAS

For the longest time I was using the default missing data display in SAS proc freq. But this isn't ideal for doing recodes, where you might want to do something specific with the missing values, and so you want them to show up in tabulations and cross-tabulations so you can see where they go. Here's a great page on how to change how missings display in output.

http://support.sas.com/documentation/cdl/en/procstat/63104/HTML/default/viewer.htm#procstat_freq_sect016.htm

After the vars you list on the table statement, include one of the following options.

The first option will display missing values and include them in the % and cumulative % calculations for the table. Helpful if you want to see what % of cases are missing.

/ missing

The second option will display missing values in your table, but it won't include them in the percentage calculations (i.e., it's "print only").

/ missprint