[Discussion] can we stop arguing about below spec until somebody posts a number
Asking properly rather than in a comment on somebody else’s thread: can we stop arguing about below spec until somebody posts a number.
On inter-lab disagreement, which generates more heat here than anything else.
Two services running different gradients, integrating differently, at possibly different wavelengths, will not produce identical numbers on the same material. A point either way is ordinary. Half a point is close agreement.
The productive response to a gap that size is to post both results with both methods and let the log accumulate. The unproductive response is to pick the lower number, call it the truth, and open a dispute. Members have done the first for long enough now that the bands in the vendor tables are genuinely informative.
Inter-lab variance on this assay runs roughly a point either way, driven mostly by gradient and integration. Two results inside that band agree; they do not disagree quietly.
The template is vendor, compound, batch, service, claim, result, and who paid. Every one of those fields exists because a result missing it has been argued about here before.
Ask me anything specific. Anything general I will probably get wrong.
best — the order this archive was captured in
What a result posted here is actually worth, and how to make yours worth more.
A single figure with no batch identifier is about a vial nobody can locate. Add the batch and it becomes about a lot. Add the claimed figure from the certificate and it becomes a comparison. Add the service and the date and it becomes reproducible. Say that you paid for it yourself and it becomes independent.
Five extra fields, thirty seconds of typing, and the difference between a comment and a row in the log that will still be useful in three years.
Nudging rather than removing: the standard template is in the sidebar and this post is missing the batch field.
vendor, compound, batch, service, result — that is the template
SGN came back 98.2% on a claimed 97.5%, which is agreement not a discrepancy
SGN came back 98.2% on a claimed 97.5%, which is agreement not a discrepancy
Adding the boring but useful bit: say whether you paid for it. It is the basis of the whole log.
Batch number and date of analysis?
Fourth lot from the same supplier in the log now and the band has been tight the whole way. That consistency is the actual finding.
Yes. Two services on the same batch is the strongest thing an individual member can produce, and it is not expensive.
Push back: three tests on one lot is one lot. It tells you about that lot and almost nothing about the next one.
three lots beats three tests on one lot
if you are going to test, test the thing you actually received
[deleted]
Split one vial between Medutest and Janoshik. The two numbers were within half a point of each other and I stopped worrying about which lab to trust.
Yes — date of analysis, because a result from two years ago describes a different manufacturing month.
This. The trend across separate lots is the number that tells you about a process rather than a vial.
Chain of custody is why member-funded testing is worth more than a supplied certificate: the vial tested is the vial that arrived at a member’s door.
Do you have the trace, or only the summary?
area percent unless the report says otherwise
Is that the same lot as the one in the thread from last month?
Chain of custody is why member-funded testing is worth more than a supplied certificate: the vial tested is the vial that arrived at a member’s door.
meera_oyelaran is right that the band matters more than the peak. Consistency across lots is the finding.
inter-lab variance runs a point or two, plan your outrage accordingly
What was the claim on the certificate you are comparing against?
post the claim next to the result or the number floats
- 1if you are going to test, test the thing you actually received13 comments in this branch · started by u/fatima_wojcik
- 2What a result posted here is actually worth, and how to make yours worth…8 comments in this branch · started by u/plateau_patrol