I note that in another package, data can be completely subset into separate
temporary datasets without having any effect on the original. I know, of
course, that stata can do the same thing using "by" or "drop/keep", but the
logic seems different (in Stata, the "by" statements clearly need to
continually recur, and using "keep" requires great caution).
Yes of course I know this is just a taste issue, but perhaps there is a
command I'm unaware of. Any suggestions?
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