Adding the clinical framing, because it changes how the question reads. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.
BiostatsBrad said:One practical note: write down what you did and when, before you need it.
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.
BiostatsBrad said:One practical note: write down what you did and when, before you need it.
Genuinely useful, thank you. I had the facts and not the framework. Sending this to two other people who asked me the same thing last week.
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Shop Reference StandardsClinical perspective, offered as context rather than as advice. Start from the measurement rather than the conclusion. Almost every disagreement here turns out to be two people measuring different things and comparing the numbers anyway.
Moderator note: the sourcing question belongs in the vendor section and has been split out. Thread quality here is what the rules are for. Keep it up.