On Tue, 29 Jul 2003, Damon Wischik wrote: > > As I described before, I have a snapshot of a population taken at a > certain time. I am interested in an age-related disease, which progresses > healthy->A->B. (There is no recovery.) For each individual, I know their > age (in years) and the stage of the disease. There are roughly 800 cases, > with ages spanning 40 years. >
I haven't followed this thread so I don't know if it has already been mentioned, but if all you have is a snapshot, then any inference you make on disease progression will have to be based on the assumption that both the disease and the population demographics are in steady state. I would think that in many real world disease/population cases this will be a very poor assumption. I'm afraid I can't see any obvious way around this other than to look for some sort of cohort/followup data. Regards, Luke Whitaker. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
