> It may also be curious to find out what were the things that have actually lead to the effect if not the one we were checking. This sounds like a good idea i

> It may also be curious to find out what were the things that have actually lead to the effect if not the one we were checking. This sounds like a good idea in theory, but in practice, it is usually even harder to answer this question than the original question that yielded the data. This type of question requires extremely careful study designs, large sample sizes, accurate power estimates, etc.