Bill Dupont and Roger Harbord have recently discussed
-sts graph- with the -tmin- option.
(e.g.
. sysuse cancer, clear
. stset age, failure(died)
. sts graph
. sts graph, tmin(55)
)
As they have discussed, currently the survival graph starts at the
origin (_t = 0) with the -tmin- option, and shows a survival function
equal to one (or -per- if the -per option is specified) until time
-tmin-. At time -tmin- it then drops as if all the failures
preceding time -tmin- occurred at time -tmin- and then proceeds to
plot the remainder of the survival function. This is misleading and
should be considered a bug -- the axes should show the range of the
entire survival curve but the actual plot should start at the time
specified via -tmin-. I have already changed -sts graph- to do this,
and I expect this fix to be available in the next ado-file update.
--Jean Marie
[email protected]
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