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I agree with erex78. The former measurement doesn't tell me much; I already know what cities have the most people.

The latter measurement better indicates the probability of a chance encounter with someone who has your shared interests.

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Yeah that's a good point. I like scribu's point that it can be somewhere in between. I'll have to think on that a little.

Usually (taken from erf/error based on sample size), something grows proportional to the square root of the sample size. If using raw sample sizes, you can apply a square root to that sample size before using it (meters its impact).

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