Contract the active workfile page according to the specified sample.
Syntax
pagecontract smpl_spec
where
smpl_spec is a sample specification. Contraction removes observations not in specified sample from the active workfile page. Note that since this operation is performed in place, you may wish to backup your original page (see
pagecopy) prior to contracting.
Examples
pagecontract if income<50000 and race=2
removes all observations with INCOME values greater than or equal to 50000 and RACE not equal to 2.
pagecontract 1920 1940 1945 2000
removes observations for the years 1941 to 1944.
Cross-references