mad

index.html

<h2>Mean Absolute Deviation = <span id="y"> ... </span></h2>
<p><textarea id="x"></textarea></p>
(separate values with commas)

mad.markdown

mad

mean absolute deviation

A Pen by Jonas Almeida on CodePen.

License.

script.js

x.style.width="100%"

mean = function(x){
  var s = 0, n = x.length
  for(i=0;i<n;i++){s+=x[i]}
  return s/n
}

mad=function(x){
  var avg = mean(x)
  x = x.map(function(xi){
    return Math.abs(avg-xi)
  })
  return mean(x)
}

x.onkeyup=function(evt){
  var v = x.value;
  if(v.slice(-1)!=','){
    v=v.split(',').map(function(vi){return parseFloat(vi)})
    y.textContent=mad(v)
  }
  //console.log(v)
}