Question: In computing the Standard Deviation of a sample, why do some authors divide by n and other authors divide by n-1? I've seen both and

In computing the Standard Deviation of a sample, why do some authors divide by n and other authors divide by n-1?

I've seen both and the difference can't be attributed to the classical "divide by n for the population and divide by n-1 for a sample", a reasonable practice that yields a higher Standard Deviation for a sample.

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