RE: st: Re: Variable selection

["Sherriff, Martyn" <martyn.sherriff@kcl.ac.uk>]

Maarten,

	Many thanks for that. It looks as if "extended macro functions" is going to be my weekend reading.

Martyn


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis
Sent: 04 March 2011 09:51
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Re: Variable selection

--- On Fri, 4/3/11, Sherriff, Martyn wrote:
> Rather than write a 'locaI' to include the variables that I wish to 
> analyse I have tried to exclude the variables that I do not want as 
> follows:
> 
> qui:findname
> foreach v of varlist `r(varlist)'{
>     if "`v'" !="chew" {
>         kwallis `v',by(ur6)
>     }
>}

There is no need for such a loop, see the example below:

*------------- begin example ----------------- sysuse auto, clear

// already exclude string variables
ds, has(type numeric) 

// store remaining variable names in a local local varl `r(varlist)' 

// store the variables you want to exclude // in another local local out "foreign rep78" 

// remove the variables names you want to remove local varl : list varl - out

// check if they are really out
di "`varl'"
*--------------- end example ----------------------- (For more on examples I sent to the Statalist see: 
http://www.maartenbuis.nl/example_faq )

You can read more about this trick and many more by going to the helpfile of -macro- and click on the link to "extended macro functions".

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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