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standardDeviation javascript Code Snippet in 2022

matharrayintermediate

Last Updated: 25 September 2022

Calculates the standard deviation of an array of numbers.

  • Use Array.prototype.reduce() to calculate the mean, variance and the sum of the variance of the values and determine the standard deviation.
  • Omit the second argument, usePopulation, to get the sample standard deviation or set it to true to get the population standard deviation.
const standardDeviation = (arr, usePopulation = false) => { const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length; return Math.sqrt( arr .reduce((acc, val) => acc.concat((val - mean) ** 2), []) .reduce((acc, val) => acc + val, 0) / (arr.length - (usePopulation ? 0 : 1)) ); };
standardDeviation([10, 2, 38, 23, 38, 23, 21]); // 13.284434142114991 (sample) standardDeviation([10, 2, 38, 23, 38, 23, 21], true); // 12.29899614287479 (population)

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