INNER CODE UNIT · JavaScript

sdev

mysqljs/mysql · benchmark/analyze.js:77

function sdev() {
  if (!numbers.length) return undefined;

  return Math.round(Math.sqrt(variance()));
}

function variance() {
  var t       = 0;
  var squares = 0;
  var len     = numbers.length;

  for (var i = 0; i < len; i++) {
    var obs = numbers[i];
    t += obs;
    squares += Math.pow(obs, 2);
  }
  return (squares / len) - Math.pow(t / len, 2);
}

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