st: Checkvar updated on SSC

[Phil Bardsley <phil_bardsley@unc.edu>]

Thanks to Kit Baum, -checkvar- has been updated on the SSC archive. I've 
added "if" and "in" options.

The -checkvar- command is intended to assist in checking a created 
variable. It lists each value of the created variable and all 
combinations of the component variables that were used to create it.

For those working with survey data, -checkvar- can display the pattern 
of responses through a complex set of skip and filter questions. This is 
useful when testing a new CAPI questionnaire as well as for cleaning and 
analyzing survey data.

The -checkvar- command is modeled on the "list" option in SAS proc freq. 
See also -groups- by Nick Cox on the SSC archive.

--
Phil Bardsley <phil_bardsley@unc.edu>
Research Programming Services
Carolina Population Center
University of North Carolina
Chapel Hill, NC 27516 USA
919-966-2825
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