martine
> How do I make discrete times for my dates of visit (eg. I
> want the data to
> look like this:
>
> id1 viralload cd4 etc.
>
> t1 0
> t2 1
> t3 1
>
> id2
>
> t1 0
> t2 1
>
> id3
>
> t1
> t2
> t3
>
> I have been trying to find this in STATA help, my STATA
> book, and still cannot
> find how I need to change the dates to discrete times.
I'm unclear what criterion it is that makes t1, t2, t3
0 1 1
0 1
etc.
If the criterion is "second visit or later"
then presumably you have a time variable, so
can go
bysort id1 (time) : gen secondorlater = _n > 1
If on the other hand, you really mean
0 1 2
0 1
etc. then you can go
bysort id1 (time) : gen discretetime = _n - 1
Nick
[email protected]
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