File restructure #2

Modules/ado/plus/i/isvar.hlp

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