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Re: st: RE: data management problem


From   sara borelli <saraborelli77@yahoo.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: data management problem
Date   Sun, 6 May 2007 20:14:40 +0200 (CEST)

thank you very much!
sara
--- Maarten buis <maartenbuis@yahoo.co.uk> ha scritto:

> --- Wanli Zhao <zhaowl@temple.edu> wrote:
> > The data looks like follows:
> > 
> > firm	dept	product
> > 1	a	a, b
> > 1	b	c, r
> > 1	c	d, a
> > 2	d	d, f
> > 2	e	I, y
> > 2	f	g
> > 
> > Firm 1 & 2 each has some departments. Each
> department has some
> > products. I want to a variable which lists all the
> products a firm
> > has (a, b, c, d, r for firm 1) and for firm 2 (d,
> f, I, y, g). 
> 
> *----------- begin example --------------
> set more off
> drop _all
> 
> input firm	str1 dept	str4 product
> 1	a	"a, b"
> 1	b	"c, r"
> 1	c	"d, a"
> 2	d	"d, f"
> 2	e	"I, y"
> 2	f	"g"
> end
> 
> /*value one for the first department in each firm*/
> /*value two for the second department in each firm*/
> /*etc*/
> bys firm: gen deptnum = _n
> 
> /*store maximum number of department in local
> `Ndepts'*/
> sum deptnum, meanonly
> local Ndepts = r(max)
> 
> /*products of the first department are in variable
> products1*/
> /*products of the second department are in variable
> products2*/
> /*etc*/
> reshape wide product dept, i(firm) j(deptnum)
> 
> /*loop over departments*/
> gen prods = product1
> forvalues i = 2/`Ndepts' {
> 	replace prods = prods + ", " + product`i'
> }
> 
> /*bring the data back into original long format*/
> reshape long dept product, i(firm) j(deptnum)
> 
> /*show the result*/
> list, clean
> *-------------- 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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