The geometric mean is the nth root of n products or e to the mean log of x. Useful for describing non-normal, i.e., geometric distributions.
a vector or data.frame
remove NA values before processing
Useful for teaching how to write functions, also useful for showing the different ways of estimating central tendency.
geometric mean(s) of x or x.df.
Not particularly useful if there are elements that are <= 0.
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