7 lines
276 B
JavaScript
7 lines
276 B
JavaScript
module.exports = (arr, usePopulation = false) => {
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const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;
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return Math.sqrt(
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arr.reduce((acc, val) => acc.concat((val - mean) ** 2), []).reduce((acc, val) => acc + val, 0) /
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(arr.length - (usePopulation ? 0 : 1))
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);
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}; |