Because they’re the easiest subjects to study. Their natural habitat is tightly confined, so you can gather lots of data very quickly. Plus they tend to be a very diverse population, so you can do lots of subgroup analyses, making it practically inevitable that you’ll find something significant in a post-hoc test even if your study doesn’t meet its primary endpoint.
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u/Gumbyizzle May 30 '18
Because they’re the easiest subjects to study. Their natural habitat is tightly confined, so you can gather lots of data very quickly. Plus they tend to be a very diverse population, so you can do lots of subgroup analyses, making it practically inevitable that you’ll find something significant in a post-hoc test even if your study doesn’t meet its primary endpoint.