[EMAIL PROTECTED] (Jason Owen) wrote in message news:<[EMAIL PROTECTED]>... > Hello, > > An engineering friend of mine has encountered this formula as > a measure of "average" for a sample of N values: > > log (N) - log ( sum (10^-X) ) > > where X is a sample value and log is logarithm base 10. > > Has anyone encountered this before? The closest thing it > resembles is the harmonic mean, but it's certainly not the > same.
It seems to combine the ideas of the harmonic mean and another kind of mean that's like the anti-version of the geometric mean. GM is exp of average logs, this is - but in base 10 - like log of average exps, but with the extra twist that the "average" in the middle is the harmonic mean. Odd. What's the context? Glen . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
