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57 lines
1.4 KiB
Plaintext
57 lines
1.4 KiB
Plaintext
7 months ago
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{smcl}
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{* 20sep2005}{...}
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{hline}
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help for {hi:isvar}
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{hline}
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{title:Filter names into variable names and others}
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{p 8 17 2}
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{cmdab:isvar} {it:possiblevarlist}
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{title:Description}
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{p 4 4 2}
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{cmd:isvar} takes a list of names that might name variables in
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your dataset and filters it into a list of those names that are indeed
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variable names and a list of the others.
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{p 4 4 2}
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One application of {cmd:isvar} arises when you are moving between similar
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datasets, especially if they are large, but are not sure which variables are
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defined in which dataset. Commands such as {help describe} would fail at the
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first name not in fact a variable name. {cmd:isvar} offers a more direct way to
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establish existence or non-existence of several possible variables.
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{title:Saved results}
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{p 4 8 2}r(varlist) names of variables in current dataset{p_end}
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{p 4 8 2}r(badlist) names that do not correspond to variables in current dataset
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{title:Examples}
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{p 4 8 2}{cmd:. isvar mpg rep78 rep77}{p_end}
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{p 4 8 2}{cmd:. local OKlist "`r(varlist)'"}{p_end}
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{p 4 8 2}{cmd:. su `OKlist'}
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{title:Author}
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{p 4 4 2}Nicholas J. Cox, Durham University, U.K.{break}
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n.j.cox@durham.ac.uk
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{title:Acknowledgements}
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{p 4 4 2}This problem was suggested by Amadou Diallo.
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{title:Also see}
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{p 4 13 2}
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Online: help for {help describe}; {help unab}
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