Hello,

I am trying to run a flexible Parametric model in Stata. I study various outcomes and I run the analysis for male and females seperatly. I study risk of disease occurence and I compare patients with cancer to cancer-free. I include cancer as a time-varying covariate. The time scale is attained age and individuals are under risk from 2005 or age 20. Thus, the Entry_date is either 1/1/2005 or the date an individual turns 20.


stset end_date, failure(Outcome) enter(time Entry_date) scale(365.25) origin(time birth_date) id(id)

I use expand to define a my time-varinging variable, then I run the stpm2. The model runs for male but i get the above error message for females.


stpm2 i.cancer i.education i.country_birth, scale(hazard) df(5) tvc(cancer) dftvc(3) eform cformat(%9.2f) Level(99)


any suggestions what can be wrong? I have slightly higher number of cases among women than men which shouldn't usually be a problem. I appreciate any help or advice.


Sara