de32a204d2
http://www.calculator.net/standard-deviation-calculator.html As a one-liner it's really long, feel free to optimize the formatting here (or shorten it further somehow).
590 B
590 B
Standard deviation
Use Array.reduce() to calculate the mean of the values, the variance of the values, and the sum of the variance
of the values to determine the standard deviation of an array of numbers.
NOTE: This is population standard deviation. Use / (arr.length - 1) at the end to
calculate sample standard deviation.
const standardDeviation = (arr, val) =>
Math.sqrt(
arr.reduce((acc, val) => acc.concat(Math.pow(val - arr.reduce((acc, val) => acc + val, 0) / arr.length, 2)), [])
.reduce((acc, val) => acc + val, 0)
/ arr.length
);