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Re: st: Event within dates


From   David Kantor <kantor.d@att.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Event within dates
Date   Thu, 01 Dec 2011 18:22:57 -0500

Hi.

1: You didn't state what you did exactly.
2: I haven't tested the code; it's just a suggestion. But it looks legal to me.
3: Please see my second reply -- that starts "Oops". It offers a correction.
4: What I wrote was not complete. It was intended to sit in the context in which you had set the value of the local N. I suspect that that was the problem.
In that case, you need to precede the given code with...
 local N=_N

But you can also skip that by using macro-expression evaluation:
forval i = 1/ `=_N' {
        forval j = 1/ `=_N' {
etc. etc.

HTH
--David

At 05:34 PM 12/1/2011, you wrote:
Thanks for the approach. But I am sorry when I tried it I got an error message invalid syntax.


----- Original Message -----
From: David Kantor <kantor.d@att.net>
To: statalist@hsphsun2.harvard.edu
Cc:
Sent: Thursday, 1 December 2011, 20:51
Subject: Re: st: Event within dates

The following might work. It is an attempt to fill in some features
that were needed in your method.
But it is somewhat brute-force in its approach. It does looping over
observations (doubly), which is rarely needed.
There is probably a much better way to do this (involving -by-, for
one), but this is all I can do at the moment.
HTH
--David


forval i = 1/ `N' {
         forval j = 1/ `N' {
                 replace rs1=1 if drug[`i]==1 & id[`i']==id[`j']  &
inrange(date[`i'] - date[`j'],-56,56) in `i'
         }
}
[...]

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