geometric-mean ( seq -- x )
Statistics

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Vocabulary
math.statistics

Inputs

seq	a sequence

Outputs

x	a non-negative real number

Word description
Computes the geometric mean of all elements in seq. The geometric mean measures the central tendency of a data set and minimizes the effects of extreme values.

Examples

USING: math.statistics prettyprint ; { 1 2 3 } geometric-mean .
1.8171205928321397

Errors
Throws a signal-error. (square-root of 0) if the sequence is empty.

Definition

USING: kernel math math.functions sequences ;

IN: math.statistics

: geometric-mean ( seq -- x )
    [ [ log ] map-sum ] [ length ] bi /f e^ ; inline