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Jack comments on Existential Risk and Public Relations - Less Wrong
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Why do we think this means early test groups weren't included in the study? It just sounds like it took eight years to get the large sample size he wanted.
I think that it means that early test groups weren't included because that is the easiest way to produce the results we're seeing.
Why eight years? Did he decide that eight years ago, before beginning to collect data? Or did he run tests until he got the data he wanted, then check how long it had taken? I am reasonably certain that if he got p-value significant results 4 years into this study, he would have stopped the tests and published a paper, saying "I took 4 years to make sure the sample size was large enough."
Looking at the actually study it seems to include the results of quite a few different experiments. If he either excluded early tests or continued testing until he got the results he wanted that would obviously make the study useless but we can't just assume that is what happened. Yes it is likely relative to the likelihood of psi, but since finding out what happened isn't that hard it seems silly just to assume.