Re: st: AW: can I get standardized coefficients by standardize variables first?

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

Mandy can read up on this issue in 
http://www.stata-journal.com/article.html?article=dm0040
Maybe that drives her happiness even higher?


HTH
Martin
_______________________
----- Original Message ----- 
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, March 03, 2009 10:39 PM
Subject: RE: st: AW: can I get standardized coefficients by standardize 
variables first?


> A detail orthogonal to this thread:
>
> ds, not(type string)
>
> is a backwards way of saying
>
> ds, has(type numeric)
>
> The two are equivalent, but some may prefer the direct statement.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Martin Weiss
>
>
> So here is an implementation of Eva`s excellent advice as to the causes
> of
> Mandy`s problem:
>
> *************
> clear*
> set mem 400m
> * enter the percentage of missings here
> loc mis 0.01
> u http://www.stata-press.com/data/imeus/traffic, clear
> foreach var of varlist fatal beertax spircons unrate perincK {
> replace `var'=. if runiform()<`mis'
> }
>
> qui xtreg fatal beertax spircons unrate perincK, fe
> tempvar dummy
> g `dummy'=e(sample)
>
>
> qui ds, not(type string)
> foreach var of varlist `r(varlist)'{
> egen std`var'=std(`var') if `dummy'
> }
>
> xi: reg fatal beertax spircons unrate perincK i.state if `dummy', beta
> xtreg stdfatal stdbeertax stdspircons stdunrate stdperincK if `dummy',
> fe
>
> *
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