Imagine a simple Kaplan-Meier analysis where administrative censoring is applied at time=5 years. In other words, I may have follow-up data on persons out further but i am choosing to censor them at 5 years.
- Would it make sense to try censoring at 30 days if I was interested in short term survival? This seems to me that I am throwing data away. Is this ok to do?
- Is one testing the similarity of curves from 0 to 90 days and the other comparing curves from 0 to 5 years? Would i ever find a significant difference over the shorter time period and then not find a difference when comparing the longer period (or vice versa)?