Thanks a lot, Maarten. I'll try later but I got the logic. By the way,
department info actually may be redundant because without dept column, story
holds. I do need the number of depts for each firm though.
Willie
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Maarten buis
Sent: Sunday, May 06, 2007 5:14 AM
To: [email protected]
Subject: Re: st: RE: data management problem
--- Wanli Zhao <[email protected]> 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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