Function stddev

website-phishing/utils.js:104–111

* Calculate the standard deviation of a vector. * * @param {Array} vector The vector represented as an Array of Numbers. * * @returns {number} The standard deviation.

(vector)

 * @returns {number} The standard deviation.
 */
function stddev(vector) {
  let squareSum = 0;
  const vectorMean = mean(vector);
  for (const x of vector) {
    squareSum += (x - vectorMean) * (x - vectorMean);
  }
  return Math.sqrt(squareSum / (vector.length - 1));
};

/**
 * Normalize a vector by its mean and standard deviation.