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st: RE: 3 very basic questions


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: 3 very basic questions
Date   Tue, 14 Jun 2005 18:21:17 +0100

stats dummy

Why not use your real name? Almost all Statalist people do. 
 
> I'm a recent convert from SPSS (hence "statsdummy"). I'm having
> trouble making the adjustment. Here are three things I'd like to do,
> but am having difficulty doing (even after scouring the documentation
> & on-line discussions):
> 
> 1. Normalize my data. I'd like to set the mean to zero and the SD to 1
> for most of my variables. Is there a simple way to do this?

. help egen 

to see -std()- function. 
 
> 2. Develop a regression model in a series of steps, noting the change
> in R2 that the addition of each new set of IVs produces and whether
> that change is significant (especially useful in assessing the
> significance of interactions). For other refugees from SPSS, this
> would be akin to:
> 
> REGRESSION 
> /STATISTICS = CHA 
> /DEPENDENT y 
> /METHOD=ENTER x1 x2 x3 
> /METHOD=ENTER x12 x13 x23 
> /METHOD=ENTER x123 .

It is perhaps more Stataish to alternate -regress- and -test-. 
 
> 3. Perform the same transformation on a series of variables without
> repeating the command. For other refugees from SPSS, this would be
> akin to:
> 
> RECODE v1 v2 v3 INTO v11 v22 v33 . 

. help forval 
. help foreach 

except that these might seem a little daunting at the 
beginning of your Stata career. 

Nick 
n.j.cox@durham.ac.uk  

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