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st: R: if and if


From   "Carlo Lazzaro" <carlo.lazzaro@tiscalinet.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: R: if and if
Date   Thu, 13 Nov 2008 09:57:21 +0100

Dear Ashim,
would - help cond() - be useful for your research purposes?

Kind Regards,
Carlo
-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Ashim Kapoor
Inviato: giovedì 13 novembre 2008 8.56
A: statalist@hsphsun2.harvard.edu
Oggetto: st: if and if

Hello everyone,

I realize that there are 2 kinds if's in Stata.

Type 1 : would be something like replace j = 2 if k==2
here the replace in j would happen ONLY in the corresponding
observation of k. THIS IS WHAT I WANT.


Type 2 : the programming if something like

local j

if `j'==2 {

do something.

}

**************************************************************

I guess I want to do something which is in between the above 2.

I want to say the following : --

replace j=2 if k==2
replace m=2 if k==2
replace n=2 if k==2

in ONE shot.

so I try : -
************************************** Block A
if k==2 {
replace j=2
replace m=2
replace n=2
}
*********************************************
This does not work. Because k==2 would mean k==2 in ALL observations.
While I mean to say make j / m / n = 2 in those observations where k
is 2.

How do I do this in a quick manner in Block A  ?

I understand that I can always do :-

foreach var of   j m n {
replace `var'=2 if k==2
}

But is there a better way ?

The reason I want this is the following  : -

I want

if k==2 {
replace j=1
replace m=5
replace n=89
}

so the above method fails as I do not have the SAME value 2 to be put
in each of j / m /n.

Any slick way of doing this ?

Thank you,
Ashim
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