Sample Variance, n-1 factor

Sample Variance Equation

People often question why is there a “n-1” term when I calculate the variance. Why not divide through by “n”. Most stats courses dismiss this question by saying, “oh, that’s because you lose a degree of freedom”. What is a degree of freedom. In the video below we ignore this notion of degree of freedom and answer where the “n-1” came from when calculating sample variance.

Originally published at on August 6, 2015.

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