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st: RE: Re: tabstatmat repeatedly


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: tabstatmat repeatedly
Date   Fri, 24 Sep 2004 19:05:46 +0100

Following Michael's optimistic assumption:
the -collapse- syntax can be generated automagically: 

foreach v of var v1-v100 { 
	local text "`text' (mean) `v' (sd) sd`v' = `v'" 
} 

collapse `text' , by(category) 

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

Michael Blasnik
 
> I think you may want to use -collapse- and outsheet to get 
> the stats you
> want, but I'm not sure what you mean by category_`X' in your 
> commands -- do
> you have a different categorical variable breakout for each of the 100
> variables?  Assuming that you dont,
> 
> collapse v1 - v100 , by(category)
> 
> will give you a dataset of means by category.  Then
> 
> collapse (sd) v1-v100 , by(category)
> 
> will give you std devs.  You can combine the two commands, 
> but then you have
> to type out new names for all 100 std dev vars.. Instead you can
> use -renvars- to rename them after the fact and then use 
> -merge- to combine
> the means and std.  devs.  You may then want to re-order the 
> vars and then
> use -outsheet- to dump them to a text file.

Camelia Minoiu
 
> > I would like to obtain summary statistics (by another 
> variable) for a list
> > of 100 variables, and then save all of these in one big matrix, and
> > preferably have this exported into a text file.
> >
> > I have been following the discussion surrounding 
> -tabstatmat-as well as
> that
> > regarding the command - mat2txt-  (Feb 2004)  but running 
> mat2txt on my
> > computer gives me the error message: "version 8.2 not 
> supported" (I use
> > Stata 8) and with tabstatmat I don't know if I can do this 
> repeatedly. For
> > example, writing a tiny program such as the one below does 
> not seem to
> work:
> >
> > foreach X of varist v1-v100 {
> >     quietly tabstat `X', statistics(mean, sd) by(category_`X') save
> >     tabstatmat mat`X'
> >     svmat mat`X'
> >     keep mat`X'*
> >     dropmiss, obs
> >     outsheet using c:\data\matrix.txt
> > }
> >
> > Do you happen to know what I can do so that all the results 
> from each
> > tabstat on each variable are appended together in one big matrix?

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