Could you please help me to solve this problem when running strs command? I have tried everything and nothing works. There appears the same error as if data were not sorted.
Thanks


use colon (Colon carcinoma, all stages, Finland 1975-94, follow-up to 1995)
. generate id = _n
. quietly stset surv_mm, failure(status==1 2) id(id) scale(12)
. strs using popmort if stage==1, breaks(0 0.5 1(1)10) mergeby(_year sex _age)

Then there appears this error:
No late entry detected - p is estimated using the actuarial method
using data not sorted
r(5);