Using stlexis (stata 5) I used to be able to split follow-up time
according to cumulative dose (x) of some exposure.
For example, I could convert these three records
id timein timeout xin xout fail
-------------------------------------------
1 0 5 0 40 0
1 5 10 40 180 0
1 10 15 180 220 1
into these five records
id timein timeout fail exp_grp
1 0.000 5.000 0 0-100
1 5.000 7.143 0 0-100
1 7.143 10.000 0 100-200
1 10.000 12.500 0 100-200
1 12.500 15.000 1 200-300
making the assumption of a linear increase in cumulative dose between
readings.
Somewhere along the line the contributed command stlexis was replaced by
the official command stsplit, but I can't figure out how to do this with
stsplit. Even worse, I can't figure out how to do it at all without
going back to stlexis.
Of course there is nothing wrong with going back to earlier programs,
but stlexis relies on the Stata 5 version of stset which is very
different from the Stata 8 version, so going back involves more hassle
than simply running the program.
Any suggestions for doing this in Stata 8?
Michael Hills
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