From the other side of the consultation, briefly. 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.
Correct me if the detail matters more than I have assumed.
Dr.DermMIA said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
This matches mine closely enough to be worth saying so out loud. Posting only so the count is not one.
Dr.DermMIA 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. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.
That is the short version; the long version is somebody else's post.
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Shop Reference StandardsOne concrete data point for the thread. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.
A narrower follow-up, since the general answer is now clear:
What would you measure differently if you were starting again?