Third-party testing: difference between revisions
Diff·revision 12 → 13·22:20, 16 Nov 2024
Difference between revision 12 and revision 13 of Third-party testing. 5 lines changed; the page grew by 481 bytes.
| Revision 12 — 23:42, 29 Oct 2024 Chromatokid (talk) alphabetise the see-also list 4,445 bytes +34 | Revision 13 — 22:20, 16 Nov 2024 EndpointEnid (talk) state the date range the submitted set covers 4,926 bytes +481 | ||
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| 11 | | Purity of the sample = By [[Area percent purity|area percent]] on the material submitted | 11 | | Purity of the sample = By [[Area percent purity|area percent]] on the material submitted |
| 12 | | Content = Only if [[Peptide content|content]] is determined | 12 | | Content = Only if [[Peptide content|content]] is determined |
| + | 13 | <!-- What it cannot establish --> | |
| + | 14 | | Lot representativeness = Without [[Blind sampling|blind sampling]] | |
| + | 15 | | Provenance = Without a [[Chain of custody|chain of custody]] | |
| 13 | }} | 16 | }} |
| 14 | {{hatnote|For the document a supplier issues about its own material, see [[Certificate of analysis]].}} | 17 | {{hatnote|For the document a supplier issues about its own material, see [[Certificate of analysis]].}} |
| ⋮ | ⋮ | ||
| 35 | 38 | ||
| 36 | [[Blind sampling|Blind sampling]] — in which the laboratory does not know the origin of the sample and the supplier does not know a sample has been drawn — removes one class of bias. A [[Chain of custody|chain of custody]] documenting who held the material between purchase and analysis removes another. Reports that arise from neither are still informative, but they are informative about a narrower thing than they appear to be. | 39 | [[Blind sampling|Blind sampling]] — in which the laboratory does not know the origin of the sample and the supplier does not know a sample has been drawn — removes one class of bias. A [[Chain of custody|chain of custody]] documenting who held the material between purchase and analysis removes another. Reports that arise from neither are still informative, but they are informative about a narrower thing than they appear to be. |
| + | 40 | ||
| + | 41 | The self-selection problem operates at the level of what gets reported at all. Purchasers who commission testing are not a random sample of purchasers, and results that are published are not a random sample of results obtained. This wiki's own community tally is subject to both effects and says so.{{r|reports}} | |
| 37 | 42 | ||
| 38 | == References == | 43 | == References == |