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st: time updated

From   Elmi Naleie <>
Subject   st: time updated
Date   Wed, 2 Sep 2009 15:00:56 +0100

Sorry to email you again but I was wondering if any one had adivice
on how to go about this.
Thanks very much
> Dear Statalist,
> I would like to ask the following questions.
> I would like to generate time updated variables. I have 3 measurements
> (Creatinine, CD4 cell count and Viral load). They are all measured on
> average at 3 months at different dates.
> I would like to split the follow-up time into 3 months period (
> according to the clinic dates) and then to allocate each subject in
> each 3 months time period to creatinine band according to thier
> measurement at  the beginning of the period  i.e  (newcreatinine:
>>=90=1, 89-60=2, 59-30=3, 29-15=4, <15=5) etc.
> I am not sure how to go about this in STATA. I though I should stset
> the data in each measurements and  then split on the date of the
> creatinine measured.
> stset deathdate, f(died) origin(first seen at clinic) enter(time
> datecreatininemeasured) scale (30.5) i(id) exit(time .)
> stsplit interval, at (tmin(3)tmax)
> I will be greatful if any one have any ideas.
> Thanks very much in advance
> Best wishes
> Elmi.

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