Dr.GastroMayo said:The version of this that has an answer is narrower than the version being asked.
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.
FitDadDave said:Right, and one flattering data point from a group buy is not consistency.
That reframing is the part I needed. Printing the relevant bit and taking it with me.
Dr.GastroMayo said:The version of this that has an answer is narrower than the version being asked.
I read this differently. The confidence in this thread is running ahead of the evidence, and I would rather the uncertainty were stated than smoothed over because it is unsatisfying.
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Shop Reference StandardsAdding the numbers, since they settle part of this. 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: two posts asking for a source have been merged into one. Please search the thread before asking again. Tagging this one for the weekly digest.