Clinical perspective, offered as context rather than as advice. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
roxy_nash said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Same pattern here, and in the same order. The detail I would add is minor and it is already implied above.
roxy_nash said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Adding the part of the answer the thread has not reached. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.
Ask again with the specifics and you will get a better answer than this one.
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View ResultsAdding 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.
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?