One concrete data point for the thread. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.
One thing that is still open after NurseKim_ATL’s answer:
What did you change at the same time, and can you separate the two now?
Dr.RaviCardio said:Practical: whatever you change, write down the date and the reason.
I read this differently from Dr.RaviCardio, on substance rather than tone. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.
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View ResultsDr.RaviCardio said:Practical: whatever you change, write down the date and the reason.
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.
Ask again with the specifics and you will get a better answer than this one.
Reporting back.
Resolved, and the thing that resolved it was the least interesting suggestion in the thread. Writing that down for the next person who wants the interesting answer.