Dr.Martinez said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Agreed, and one caution: a single measurement is not a measurement. Anything that moves day to day needs a trend before it means anything at all.
That is the short version; the long version is somebody else's post.
HPLC_Greg said:International shipping tracking for cross-border ordering orders: my experience with customs in the US when ordering from overseas: Seized and…
Thank you for spelling out the reasoning rather than just the conclusion. Printing the relevant bit and taking it with me.
Dr.Martinez said:The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either.
Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. Filing an objection on the n=1 problem. Personal experience is genuine evidence about one person and very weak evidence about anybody else, and this thread keeps promoting the first into the second.
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Shop Reference StandardsThe figures, for anyone assembling their own picture. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.
Happy to go further on any of that.
Moderator note: a post naming a supplier has been edited. Discuss suppliers in the review sections, not here. Thread quality here is what the rules are for. Keep it up.