Running Average calculation implementation in Java

Quick blog and store note:

Here is a code to calculate average series of length N without the problem of overflow that naive average calculation could face.

/**
* Copyright (c) 2010, Maxim Veksler 
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/**
* Calculate average of arbitrary length series of doubles, running average ensures 
* result won't overflow.
* 
* Algorithm: CELLCOUNT represents number of cells calculated so far. 
* For each : cell
*  avg =  ((CELLCOUNT-1) * avg) + ((1/CELLCOUNT) * avg)
* 
* @param series vararg list of parameters (array of doubles).
* @return Average calculated from supplied series.
*/
public static double movingAverage(double... series) {
if(series.length < 1) {
   return 0;
  } 

  double avg = series[0];
  for(int i = 1; i < series.length; i++) {
   avg = (avg * ((double)i/(i+1))) + (series[i] * ((double)1/(i+1)));
  }
  
  return avg;
 }