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 sachinruk.github.io on August 6, 2015.

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.