Dr.Martinez said:There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.
Dr.NutriCornell said:Right, and one flattering data point from a group buy is not consistency.
This answered a question I did not know how to ask. I will report back once I have actually tried it.
Dr.Martinez said:There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. Filing an objection on the n=1 problem. Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the second.
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Shop Reference StandardsOne concrete data point for the thread. One habit that pays for itself: post the method alongside the number. A figure without its method cannot be checked, and an unchecked figure is how this community accumulates folklore.
Ask again with the specifics and you will get a better answer than this one.
Moderator note: leaving this open. It is being argued well and the disagreement is the useful part.