Adding the numbers, since they settle part of this. 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.
Correct me if the detail matters more than I have assumed.
A narrower follow-up, since the general answer is now clear:
What would you measure differently if you were starting again?
DataDave said:Practical: whatever you change, write down the date and the reason.
I read this differently from DataDave, 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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Browse GL BiochemDataDave said:Practical: whatever you change, write down the date and the reason.
Agreed, and the size of the effect matters as much as its existence. Something real and small gets treated here as though it were real and decisive.
OP back with an update, since a thread like this is useless without one.
Closing the loop. The answer turned out to depend on the detail I had left out of the opening post, which is a lesson about how to ask rather than about the subject.