public ProbabilityVector(FreqVec freqVec, double[] backgroundOccs) {
   this();
   for (int i = 0; i < probs.length; i++) {
     probs[i] = new Probability(freqVec.getFreq(i), backgroundOccs[i]);
   }
 }
 public ProbabilityVector() {
   probs = new Probability[FreqVec.getNumberOfIntervals()];
 }