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st: RE: RE: Selecting subjects

From   "Nick Cox" <>
To   <>
Subject   st: RE: RE: Selecting subjects
Date   Thu, 13 Mar 2008 10:03:23 -0000

If -time- is never missing, then 

bysort id (time) : gen v2 = time[_N] != 999 

gets you there in one. 

-gen byte v2- is a refinement on that. 


Zhiqiang Wang

Let's assume your variables are 1) time = 0, 2, 4, 8,...52, 999 and 2)
patient identification - id. 

There may be several alternatives. The following is one of them.  
. egen v1 = max(time), by(id)
. gen v2 = v1 != 999

Ziad El-Khatib

I have cohort followed over 12 months. Time points have 2 variables:
   visit: coded after the number of weeks on treatmnet:
0,2,4,8,12,16,20,24,36 & 52 (patients expected to come on these weeks)
otherwise coded 999 if unexpected visit.
   week: showing the exact week number patient came to clinic.

I am trying to generate variable with value=1 to select patients who
came at all visits (mentioned above), with intention to identify
patients who did not come to the expected appointments.

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