Geometric Mean

mctad.geometricMean() accepts an Array of n positive Numbers and returns the nth root of their product as a Number. More at the Wikipedia article.

mctad.geometricMean = function (data) { if (!Array.isArray(data) || data.length === 0) { return undefined; }

The geometric mean is only defined for positive numbers.

if (this.allPositive(data)) { return Math.pow(this.product(data), 1/data.length); } else { return undefined; } };