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help for ^nvars^
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Number of variables
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    ^nvars^ [stub] 
    
Description
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^nvars^ counts the number of variables. 

If a stub is specified, ^nvars^ counts the number of variables with names 
beginning with stub, that is stub^*^. ^nvars^ accepts both stub and stub^*^ 
as input. 

If no stub is specified, ^nvars^ counts the number of variables 
in the data set.

Examples
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    . ^nvars^
    
    testing in a program that ^myvar*^ just includes ^myvar^: 
    . ^qui nvars myvar^
    . ^if r(nvars) == 1 {^ ... ^}^ 


Author
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         Nicholas J. Cox, University of Durham, U.K.
         n.j.cox@@durham.ac.uk