measurement method and size data
How to measure, and what the number means
The method, done the way the published studies do it, plus what the distributions actually look like once you stop reading forum posts.
Latest
The condom-fit literature
Studies run to size condoms measure erect girth and length self-reported at home, with a fitted product as the reward; they are a separate dataset from the clinical pool.
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Finding the landmark
Bone-pressed means the ruler stops on bone at the base, above the shaft; here is how to find that spot and know you have it.
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Precise, accurate, or neither
Three tight readings can all be wrong the same way, and three scattered readings can average to the truth; the two problems have different fixes.
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How hard to press
Bone-pressed is a stop, not a force; the reading is repeatable when the ruler stops on bone every time, and it wanders when pressure varies.
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The phone as a ruler
An on-screen ruler is only as accurate as the app's knowledge of your screen's pixel density; check it against a card before trusting it, and it cannot press to bone.
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What the top percentile means in centimetres
Under the normal assumption the 99th percentile sits about 2.33 SD above the mean; the Veale figures show how far that is and how few claims survive it.
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The measurement card
Every rule that matters, on one card: state, landmark, line, angle, site, tension, three readings, median, method line.