lib/bench.js
function recordSpeed (child, speed) {
    child.runCount += sampleSize
    if (passCount > 1) {
      var square = Math.pow(speed - child.speed, 2)
      child.variance += (square - child.variance) / (passCount - 1)
    }
    child.speed += (speed - child.speed) / passCount
  }
function recordSpeed (child, speed) {
    child.runCount += sampleSize
    if (passCount > 1) {
      var square = Math.pow(speed - child.speed, 2)
      child.variance += (square - child.variance) / (passCount - 1)
    }
    child.speed += (speed - child.speed) / passCount
  }
function recordSpeed ( child , speed ) { child . runCount += sampleSize if ( passCount > 1 ) { var square = Math . pow ( speed - child . speed , 2 ) child . variance += ( square - child . variance ) / ( passCount - 1 ) } child . speed += ( speed - child . speed ) / passCount }
Incorporate a speed sampling into the mean speed and (running) variance.
Incorporate a speed sampling into the mean speed and ( running ) variance .