unbiased estimate of population variance; sample variance (with Bessel's correction)
In statistics, the variance calculated by dividing the sum of squared deviations by n-1, used as an unbiased estimator of the population variance. Often contrasted with 標本分散 (sample variance dividing by n).
The unbiased variance is used when estimating the population variance from a sample.
Excel's VAR.S function calculates the unbiased variance.