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Sunday, April 25, 2010
Harmonic Mean v Geometric Mean
Harmonic Mean is what we are used to using around here. You take the recipricol of numbers, average them out, and take the recipricol of that. So, N / (1/x1 + 1/x2 + ... 1/xN). The Bill James Power Speed Number is one such example (Bill used two terms).
The Geometric Mean, as Peter was kind enough to tell me, is (x1 * x2 * ... *xN) ^ (1/N). So, if you had two terms, you would multiply your two numbers, and take the square root.
(Note that on B-R.com, if you hover over the Power Speed # text, it’s noted as a geometric mean, but it’s actually a harmonic mean.)
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