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Re: st: Predicting sdres in stata


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Predicting sdres in stata
Date   Wed, 20 Jul 2011 08:19:46 -0400

without knowing what depenVar1 and depenVar2 are, it is not possible to
fully answer the question

however, note that what you are asking for are the predicted values from
the equation and this depends solely on the value of the constant and
the value of the coefficient for BSA; apparently, these are "very
similar" in the two regressions; do you mean to ask for the predicted
values or are you trying to predict some kind of residual? if you want
some kind of residual, you will need to add an option; see -h regress
postestimation- and click on "predict"

Rich

On 7/20/11 8:05 AM, Lars Folkestad wrote:
> Hi Stata Listers
> 
> This is probably a simple question for you all. I just cannot see my way
> through it.
> 
> I am doing liniar regression for different variables as a way to adjust for
> Body Surface Area. I do the following
> 
> . regress depenVar1 BSA, vce(robust)
> . predict sdres
> . qnorm sdres
> . swilk sdres
> . predict adjdepenVar1
> . drop sdres
> 
> . regress depenVar2 BSA, vce(robust)
> . predict sdres
> . qnorm sdres
> . swilk sdres
> 
> The two swilks tests give the exact same p-value and the qnorm graf is
> identical.
> 
> I cannot understand how. For your information i am new to stata and
> regression and my statistically knowledge is low.
> 
> Why is the two swilks tests and qnorms the same?
> 
> lars
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