code: protected void setMoments() {
  		moments.clear();
  		for(Integer i: momentDegrees)
  			moments.put(i, 0.0);
  		for(Double d: insertStat.keySet()) {
  			for(int j: momentDegrees)
  				moments.put(j, moments.get(j)+Math.pow(d-expectation, j)*(insertStat.get(d)/observationCount));
  		}
  	}
docs: Determines moments (probabilistic measure) of all degrees specified by {@link #momentDegrees}.
  Moments are characteristics of random variables (in this case relating to the inserted values)
  <ul>
  <li>2nd moment: variance</li>
  <li>3rd moment: skewness (Schiefe)</li>
  <li>4th moment: kurtosis (Woelbung)</li>
  <li>...</li>
  </ul>