code: public void normalize() {
  		double sum = 0;
  		for(Entry e:entries.values())
  			sum+=e.getAssocRate();
  		if(sum != 0) {
  			for(Entry e:entries.values())
  				e.setAssocRate(e.getAssocRate()/sum);
  		}
  		setDirty();
  	}
docs: Normalizes all <code>assocRates</code> so that their sum is 1