Adding the clinical framing, because it changes how the question reads. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
claudia_zurich said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
This is my experience too, for whatever a second data point is worth.
claudia_zurich said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
There is a second half to this that has not been said yet. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.
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Shop Reference StandardsOne concrete data point for the thread. The boring version of this is the one that works, and the boring version is: measure a baseline, change one variable, wait, measure again under the same conditions. Nobody wants that answer and it is still the answer.
Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful. Thread quality here is what the rules are for. Keep it up.