code: function(data) {
      var values = [],
          i      = 0;
      for (i = 0; i < data.length; i++) {
        values.push(this.normalise(data[i]));
      }
      return values;
    }
docs: Runs this.normalise on each value.
  
  @param {Array} data Values to normalise
  @returns {Array} Normalised values