Geometric Mean: is there a built-in?

r statistics built-in geometric-mean
doug picture doug · Apr 8, 2010 · Viewed 79k times · Source

I tried to find a built-in for geometric mean but couldn't.

(Obviously a built-in isn't going to save me any time while working in the shell, nor do I suspect there's any difference in accuracy; for scripts I try to use built-ins as often as possible, where the (cumulative) performance gain is often noticeable.

In case there isn't one (which I doubt is the case) here's mine. 

gm_mean = function(a){prod(a)^(1/length(a))}

Answer

Mark Byers picture Mark Byers · Apr 8, 2010

No, but there are a few people who have written one, such as here.

Another possibility is to use this:

exp(mean(log(x)))

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