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A comment on How many flies are in my apartment?. Parent comment

Re:How many flies are in my apartment? by m12k on Friday June 18, 2021 @08:32AM (#27549635)
Right, if you're measuring long enough that predators eating some of the flies could be an issue, then you'd want to mark them with something only visible under a blacklight, or similarly "neutral", so it doesn't introduce a bias.
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Re:How many flies are in my apartment? by marcosdumay on Friday June 18, 2021 @02:23PM (#27553279)
If predators or age (or moving out or into the measured area) are a factor, they are already biased and keeping your method neutral will still give you very wrong results.
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Re:How many flies are in my apartment? by Woberto on Friday June 18, 2021 @10:24AM (#27550633)
Unless the predator can see in the UV spectrum, like bats
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