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Re: st: Writing output from byvar and tab to dataset


From   Olalekan Uthman <uthlekan@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Writing output from byvar and tab to dataset
Date   Sat, 10 Nov 2007 04:31:59 -0800 (PST)

Dear Maarten,

Thanks for the prompt reply. That is exactly what I am
looking for.

Regards.

Olalekan Uthman
--- Maarten buis <maartenbuis@yahoo.co.uk> wrote:

> --- Olalekan Uthman <uthlekan@yahoo.com> wrote:
> > I am trying to write results fom byvar and tab
> result
> > to a dataset (e.g):
> > 
> > . webuse hiv
> > 
> > . byvar  cd4: tab  hiv
> <snip>
> > cd4	hiv0	hiv1	total	
> > 0	1	2	3		
> > 1	2	3	5
> > 2	3	1	4	
> 
> First of all note that -byvar- is a user written
> command (and pretty
> old). The way you use it can also be done with
> official Stata's -by- or
> -bysort- commands. You can get the dataset you want
> by using a
> combination of -contract-, -reshape-, and -egen-, as
> is shown in the
> example below. Also see the helpfiles of those
> commands for the
> details.
> 
> *------------- begin example -------------
> webuse hiv, clear
> bys cd4: tab  hiv [fw=f]
> contract hiv cd4 [fw=f]
> reshape wide _freq, i(cd4) j(hiv)
> egen tot = rowtotal(_freq0 _freq1)
> list
> *------------ end example ---------------- 
> (For more on how to use examples I sent to the
> Statalist, see
> http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
> 
> Hope this helps,
> Maarten
> 
> 
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
> 
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
> 
> +31 20 5986715
> 
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
> 
> 
>      
>
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