I’m not certain why I used the word “bias”. I think I was getting at that the data isn’t representative of the population of interest.
Regardless, no other method can solve the problem specified without additional information (which you claimed). And with additional information, it’s straightforward prediction again.
That is, condition on their prior health status, not just the fact they’ve been given the drug. And prior probabilities.
I’m not certain why I used the word “bias”. I think I was getting at that the data isn’t representative of the population of interest.
Regardless, no other method can solve the problem specified without additional information (which you claimed). And with additional information, it’s straightforward prediction again.
That is, condition on their prior health status, not just the fact they’ve been given the drug. And prior probabilities.