-help drop- shows that the syntax:
-drop varlist-
does not permit an -if- qualifier.
Perhaps:
foreach var of varlist cross* {
qui su `var'
if `r(max)'==0 {
drop `var'
}
}
Phil
Quoting Socrates Mokkas <[email protected]>:
> Hello All,
>
> I have a problem with dropping variables. This is my small loop:
>
> foreach var of varlist cross* {
> qui su `var'
> drop `var' if `r(max)'==0
> }
>
> Why is the invalid syntax comming up? What I want to do is to drop variables
> ( included in the varlist cross*) if they have values only of zeros or
> missing values. Am I missing the obvious here?
>
> Thanks a lot!
>
> Regards,
> Socrates
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
--
Philip Ryan
Associate Professor
Discipline of Public Health
Director, Data Management and Analysis Centre
Associate Dean (IT)
Faculty of Health Sciences
University of Adelaide
5005 South Australia
AUSTRALIA
CRICOS Provider Number 00123M
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