Combining survival rates for Markov model
I'm trying to average cancer recurrence rates across a few trials.
The issue I'm running into is that the trials are of different duration (e.g. 5 years and 8 years). The majority of recurrences happen at the beginning of the trials so adding rates won't work (because the last few years of a long trial will have no recurrences and will skew the results). Alternatively, assuming that the recurrence happens within the shortest period of time is a possible way to do it but isn't ideal. Is there a better way?
I don't have the Kaplan Mayer data so I can't combine them that way.
Thank you so much!