Blind sampling: difference between revisions
Diff·revision 4 → 5·01:14, 24 Oct 2024
Difference between revision 4 and revision 5 of Blind sampling. 2 lines changed; the page grew by 365 bytes.
| Revision 4 — 12:24, 7 Oct 2024 Chromatokid (talk) expand §How this wiki handles it 3,109 bytes +142 | Revision 5 — 01:14, 24 Oct 2024 EndotoxinEd (talk) split §What a report shows from §What it does not 3,474 bytes +365 | ||
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| 7 | Almost no independent testing of research peptides is blind in this sense. The ordinary sequence is that a purchaser buys material, chooses a vial, and sends it to a testing service. Every step of that is under the purchaser's control, and the supplier knows in advance that some proportion of its output will be tested but not which.{{r|reports}} | 7 | Almost no independent testing of research peptides is blind in this sense. The ordinary sequence is that a purchaser buys material, chooses a vial, and sends it to a testing service. Every step of that is under the purchaser's control, and the supplier knows in advance that some proportion of its output will be tested but not which.{{r|reports}} |
| 8 | 8 | ||
| + | 9 | The consequence is narrow and important, and this wiki states it wherever it publishes a test result: '''a non-blind result describes the vial that was tested.''' It does not describe the lot, the order, or the supplier, and no quantity of such results aggregates into a statement about any of those, because the selection mechanism that produced them is unknown. | |
| + | 10 | ||
| 9 | == What blinding is for == | 11 | == What blinding is for == |
| 10 | Sampling is the step that connects a measurement to a population. A result is only as good as the answer to the question "of what is this a sample?", and three separate failures can break that connection. | 12 | Sampling is the step that connects a measurement to a population. A result is only as good as the answer to the question "of what is this a sample?", and three separate failures can break that connection. |