Dr.PathRoch said:One practical note: write down what you did and when, before you need it.
That is right for the common case. Whether it is right for the case being asked about depends on a detail that has not been given.
Clinical perspective, offered as context rather than as advice. It is worth asking what the claim would look like if it were false. If nothing would look different, it is not a claim about the world and no amount of discussion will settle it.
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Shop Reference StandardsOld thread, but it comes up first when you search for this, so it is worth updating. 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.
julia.endo said:It is worth asking what the claim would look like if it were false.
Coming at julia.endo’s question from a different direction. It helps to ask what evidence would change your mind before you look at any. If nothing would, the discussion is not about evidence, and it is better to say so early than to spend nine posts discovering it.