two labs, same vial, 98.1 and 96.4. both right?
Yes, probably, and this thread exists so I can link it instead of retyping it. Sources of legitimate disagreement on the same physical sample, roughly in order of how much they contribute: Integration. Where the analyst draws the baseline and where they cut a shoulder. On a trace with a des-amido form eluting 0.4 min…
Integration being first on that list is correct and under-appreciated. Two competent analysts given the same raw trace will produce different numbers, and the difference is not error, it is judgement.
Somebody should run a round-robin: one trace, twenty people, publish the spread. I suspect it would be wider than most of the vendor disputes this site has had.
i said the same thing in a c/coa thread yesterday. i will post a raw trace this week if you organise it.
Organising it. Post the trace with the method and no interpretation, I will collect submissions by modmail and publish the distribution with nobody named.
put a deliberately ambiguous shoulder in it. that is where the variance lives and a clean trace will just show everyone agreeing.
i have exactly the trace for that. 97.9 with an enormous shoulder that i still cannot confidently call.
that is the one from the ERP thread? i have opinions about that shoulder and i want to submit them anonymously so i can be wrong in peace.