i had a result i am fairly sure was a handling error on my side and i logged it as such
#test-results 2025-07-24
Thursday30 messages8 participantstimes are UTC
Highlights from this day
- monoisotopic — anyone had a result they think was a lab error rather than a bad vial 06:06
- bad_batch_not_scam — the results in this channel skew because people test when they are suspicious. that is selection bias and it is real 08:26
- swirl_not_shake — my sheet has 8 lots from JEEP with a spread under a point, which is tight 13:57
how many lots do you need before you can say anything about a supplier
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
attach the pdf
whats the lot
anyone had a result they think was a lab error rather than a bad vial
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 / 10mgquantity testing is usually a separate line item and it is the one worth paying for
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
[edited]if you are testing to settle an argument you will not settle it with n of 1
follow up how do you separate batch variance from supplier variance
update from 3 months ago: retested the same supplier, result came back better, logged both
while im here the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
99.4 against a certificate of 97.4 is fine. the same supplier landing low four times in a row is a question
[edited]if the vial has been through a bad transit you are testing the transit as much as the supplier
one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
is quantity testing available as a separate thing or bundled
do the results in this channel skew because people test when suspicious
nice result
the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
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test it again
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a single sample tells you about a single vial. that is genuinely all it tells you
Channel stats, last 30 days: 96 messages from 17 members.
thats within range
selection bias
how do you post a result so it is actually useful to somebody in a year
posting my VendorInvestigate result on lot F-1330, what do people make of it
i have never regretted spending the money on a test. i have regretted not testing twice, for what its worth
a point or two between the certificate and an independent result is inside what two labs disagree by
update on the earlier thing log the boring results too. a channel that only records failures produces a false picture
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log the lot number
my sheet has 8 lots from JEEP with a spread under a point, which is tight
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