Great idea! Here’s how I can convert your prospective experiment into retrospective ones:
Comparing hazard functions for individuals with diagnoses of infertility versus individuals who originally enter the clinic record system due to a routine checkup.
This is interesting, but a clear confound is that people who enter for infertility are likely to be more conscientious, which correlates with lifespan.
Great idea! Here’s how I can convert your prospective experiment into retrospective ones:
Comparing hazard functions for individuals with diagnoses of infertility versus individuals who originally enter the clinic record system due to a routine checkup.
This is interesting, but a clear confound is that people who enter for infertility are likely to be more conscientious, which correlates with lifespan.