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bradurani/variance-formula.txt

Created October 3, 2013 04:31
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Variance Formula
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variance-formula.txt
Variance = SD^2
SD^2 = [SUM((X-M)^2)]/N
Square the deviation so it doesn't sum to zero
SQRT(SD^2) = SD
SS = SUM of Squares = SUM((X-M)^2
MS = Mean Squares = [SUM((X-M)^2)]/N
For inferential stats use:
[SUM((X-M)^2)]/N-1
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