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EHeller comments on How not to sort by a complicated frequentist formula - Less Wrong
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Why a Poisson distribution? It seems fairly clear we are looking at Bernoulli trials (people who look either upvote, or not). I doubt its a rare enough event (though it depends on the site, I suppose) that a poisson is a better approximation than a normal.
I think it's reasonable to model this as a Poisson process. There are many people who could in theory vote, only few of them do, at random times.
You'd need to know how many people read each comment, though.