Hi, not sure if this is the best place to ask this statistical question, but here it goes: Does doing survival analysis mandatorily require consecutively recruited patients? If I have a retrospective patient sample, but not consecutively recruited, does it necessitate invalidity of the use of survival analysis (for example: Kaplan Meier analysis or Cox regression, etc). Or as long as the patient sample is a random sample of the population (though it may be hard to prove that), it will be ok? Thanks for sharing your thoughts __________________________________