code: function ( obj ) {
  		var nth = obj.length,
  		    n   = 0,
  		    mean;
  
  		if ( nth > 0 ) {
  			mean = array.mean( obj );
  
  			array.each( obj, function ( i ) {
  				n += math.sqr( i - mean );
  			} );
  
  			return n / nth;
  		}
  		else {
  			return n;
  		}
  	}
docs: Finds the variance of an Array ( of numbers )
  
  @method variance
  @param  {Array} obj Array to parse
  @return {Number}    Variance of the Array ( float or integer )