st: Creating time-dependent covariates to replicate the tvc option for stcrreg

["Travis Coan" <tcoan@law.harvard.edu>]

Dear Statalist,

I am trying to use interaction terms that I created manually to
replicate the results provided by the tvc option after Stata's stcrreg
command. Needless to say, I am not having much success. 

I have tried to use the suggestions provided in Stata's "tvc note" help
file (help tvc_note) for stcox. For example, with the Hypoxia Study data
used in the Stata manual (Example 1, pg. 200):

stset dftime, failure(failtype == 1) id(stnum) 
stsplit, at(failures)
gen ifptime = ifp*_t
stcrreg ifp tumsize pelnode ifptime, compete(failtype == 2)

These results are different from those produced by Stata's tvc option:

stcrreg ifp tumsize pelnode, compete(failtype == 2) tvc(ifp)

If anyone has any advice on this issue (or could point me to resources
on the issue), I would greatly appreciate it. Thanks so much for your
consideration.

Cheers,
Travis

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