The right question for any home test is: what physical quantity does it measure, and what would have to be true for that quantity to answer your question? Most disappointment comes from skipping it.
What a simple presence test is genuinely useful for — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below.
Trying to work out what would count as evidence on simple presence test, before collecting any. This is the part I usually skip and it is the part that makes the rest useful.
If two explanations predict the same observation, observing it does not help. So: what observation would separate them?
The right question for any home test is: what physical quantity does it measure, and what would have to be true for that quantity to answer your question? Most disappointment comes from skipping it.
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Coming back to: Lateral-flow and colorimetric approaches: the specificity problem
On the subject in the title: Lateral-flow and colorimetric approaches: the specificity problem Working notes rather than a conclusion. Lateral-flow and colorimetric approaches — I have the observation and I…
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+77 | 89 | 16k | 9h |
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Reflectance and photometric devices: precision in practice
On the subject in the title: Reflectance and photometric devices: precision in practice Working notes rather than a conclusion. I was wrong about reflectance and photometric devices in a thread last spring…
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2 | 2.2k | 10mo | |
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About the Home & field testing category
What consumer-accessible tests can and cannot tell you. Mostly a subcategory about limitations. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with…
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4 | 51k | 11mo | |
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What consumer-accessible tests can and cannot determine — a second dataset
What consumer-accessible tests can and cannot determine — a second dataset I have a specific reason for asking rather than idle curiosity, and the context is below. Posting a small dataset on…
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+117 | 131 | 45k | 10h |
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A comparison of home results against a laboratory result on the same vial
Posting this under the heading it deserves: A comparison of home results against a laboratory result on the same vial Everything below is what sits behind that. Comparison of home results against: setting out…
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+61 | 65 | 35k | 8mo |
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Repeatability versus intermediate precision
Repeatability versus intermediate precision — setting out what I have, and where I think it stops being reliable. Trying to establish the boundary conditions on repeatability versus intermediate precision.…
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+119 | 134 | 34k | 13mo |
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Submitting a sample: the process end to end
On the subject in the title: Submitting a sample: the process end to end Working notes rather than a conclusion. Submitting a sample keeps being re-asked here and I think that is because the answer is…
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+99 | 114 | 29k | 21h |
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Reconciling a supplier certificate with an independent result
Reconciling a supplier certificate with an independent result — setting out what I have, and where I think it stops being reliable. Reconciling a supplier certificate: setting out the arithmetic in full,…
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+18 | 24 | 347 | 9mo |
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Pricing far outside the range, in either direction
Posting this under the heading it deserves: Pricing far outside the range, in either direction Everything below is what sits behind that. A question about pricing far outside the range that I think has a…
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+3 | 7 | 27k | 7mo |
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Coming back to: Pricing far outside the range, in either direction
Pricing far outside the range, in either direction Writing it up because I had to work it out twice and would rather nobody else did. Pricing far outside the range — I have the observation and I do not trust…
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+22 | 26 | 325 | 2y |