rachel_ABQ said:The distinction that resolves most of these threads is between what is true on average and what is true for one person.
There is a second half to this that has not been said yet. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.
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.
A narrower follow-up, since the general answer is now clear:
What did you change at the same time, and can you separate the two now?
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Browse GL BiochemVendorMark said:Practical: whatever you change, write down the date and the reason.
Worth saying that the confident version of this is more useful to the person writing it than to the person reading it.
VendorMark said:Practical: whatever you change, write down the date and the reason.
That holds where the measurement is reliable. Where it is noisy — and a lot of what gets tracked here is noisy — the same reasoning produces confident nonsense.