pete_RVA said:Start from the measurement rather than the conclusion.
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.
Found this through search years later and it is still the best discussion of the question, so adding one thing. Say what you would expect to see if you were wrong, before you look. It is a small discipline and it changes what you notice.
From the other side of the consultation, briefly. Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then measure again under the same conditions.
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View Resultssarah_TO said:Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then…
Same experience, arrived at from the opposite direction.
sarah_TO said:Order of operations matters more than any single choice here: establish a baseline, change one thing, wait long enough for it to express itself, then…
Adding the part of the answer the thread has not reached. 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.