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st: Re: loop code problem


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: loop code problem
Date   Mon, 23 Mar 2009 22:24:00 +0100

<>

Where in your dataset is this variable "lister" that you condition on in the loop? And where do you actually fill the "matchedname" variable whose contents you complain about?


HTH
Martin
_______________________
----- Original Message ----- From: "Li, Ihsuan" <ihsuan.li@mnsu.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, March 23, 2009 10:00 PM
Subject: st: loop code problem


Hi statalisters:

I can't figure out the correct coding to create a new variable "matchedname". My data was retrieved using propensity score matching technique and it returned _id which is unique to each firm. Each firm also has an unique cusip number. The first three firms (atna, Sealaska, and aleut) were matched to three other firms (petrox, Oregon, and ripley). I know that from the _n1 column, which lists the matched company's particular id.

What I am trying to do is create string variable "matchedname" that lists the names of the three firms that were matched to the first three observations.


Example of my data:

Firm cusip _n1 _id matchedname
atna 100 2569 9521
sealaska 101 4526 9823
aleut 104 325 357
petrox 10001 . 2569
oregon corp 10002 . 4526
ripley 10003 . 325


I tried the following code, and it returned the same _n1 on the matchedname column instead:

. gen matcheri=.
(6 missing values generated)

. gen matcherj=.
(6 missing values generated)

. gen matchernum=.
(6 missing values generated)

. forvalues i=1(1) 6 {
 2. forvalues j=`i'(1) 6 {
3. replace matcheri=1 in `i' if lister[`i']== id[`j'] & lister[`i']!=. & id[`j'] !=. 4. replace matcherj=1 in `j' if lister[`i']== id[`j'] & lister[`i']!=. & id[`j'] !=. 5. replace matchernum=lister[`i'] if lister[`i']== id[`j'] & lister[`i']!=. & id[`j'] !=.
 6. }
 7. }


What is wrong with this code?


Thanks in advance.

Ihsuan




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