the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
[edited]#test-results 2025-01-30
Thursday30 messages9 participantstimes are UTC
Highlights from this day
- lot_number_lou — ok so post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later 18:13
- back_from_away — how many lots do you need before you can say anything about a supplier i test roughly every tenth vial. it is a sampling strategy, not paranoia 19:39
- back_from_away — i have never regretted spending the money on a test. i have regretted not testing twice 19:53
- VialBot — Testing queue: 3 submissions open, 108 awaiting dispatch. 20:00
- bpc_sceptic — does a bad result on one lot condemn the whole supplier 20:28
has a supplier ever disputed a result posted here
ok so post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
fridge-temps.csv
628 rows · not retained in the public archive
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which lab
selection bias
posting my Janoshik result on lot SG-1177, what do people make of it
[edited]my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
genuine question update from 23 months ago: retested the same supplier, result came back better, logged both
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm, i have it written down somewhere
when did you buy it
anyone tested the same lot twice at different labs
whats the lot
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sorry to jump in quantity testing is usually a separate line item and it is the one worth paying for
how do you separate batch variance from supplier variance
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
if you are testing to settle an argument you will not settle it with n of 1
how many lots do you need before you can say anything about a supplier
i test roughly every tenth vial. it is a sampling strategy, not paranoia
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attach the pdf
i have never regretted spending the money on a test. i have regretted not testing twice
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgok so the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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Testing queue: 3 submissions open, 108 awaiting dispatch.
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log the boring ones
how much does sample handling on my end affect the number
does a bad result on one lot condemn the whole supplier
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weigh the vial before you reconstitute. it costs nothing and catches the common failure
i test roughly every tenth vial. it is a sampling strategy, not paranoia
right so coming back after 7 months with a follow up result, where do i put it
whats the underfill rate people are actually seeing
right so my sheet has 3 lots from WWB with a spread under a point, which is tight
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally