carl_compliance said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Correct, and worth adding that it is reversible. Nothing being described here is a one-way door, which changes how cautious it is reasonable to be.
JenMemphis said:That holds where the measurement is reliable.
Thank you for spelling out the reasoning rather than just the conclusion. Printing the relevant bit and taking it with me.
carl_compliance said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
I read this differently from carl_compliance, on substance rather than tone. The counter-case has not been addressed. Somebody upthread described the situation that does not fit, and the thread moved on rather than engaging with it, which is the failure mode this board is supposed to avoid.
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View ResultsOne 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.
Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful. Tagging this one for the weekly digest.