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st: dropping missing variables
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Is there a way in which I can drop variables that have only missing
observations? This is something that happens quite often in general
purpose surveys in which specific sub-groups are analyzed. It is quite
annoying to keep all those unnecessary variables in memeory, and quite
tiring to identify and eliminate them all.
Any suggestions are welcome.
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Version: PGPfreeware 6.0.2i
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