Package umontreal.iro.lecuyer.stat

Examples of umontreal.iro.lecuyer.stat.Tally


         int tmp = i;
         i = j;
         j = tmp;
      }

      Tally tallyi = get (i);
      Tally tallyj = get (j);
      if (tallyi == null || tallyj == null)
         return Double.NaN;
      int n = tallyi.numberObs();
      if (n != tallyj.numberObs()) {
         log.logp (Level.WARNING, "ListOfTalliesWithCovariance", "covariance",
            "Tally " + i  + ", with name " + tallyi.getName() + ", contains "
            + n + " observations while " +
              "tally " + j + ", with name " + tallyj.getName() + ", contains " + tallyj.numberObs() + "observations");
         return Double.NaN;
      }

      if (n < 2) {
         log.logp (Level.WARNING, "ListOfTalliesWithCovariance", "covariance",
            "Tally " + i + ", with name " + tallyi.getName() + ", contains " + n + " observation");
         return Double.NaN;
      }
      if (tallyi instanceof TallyStore && tallyj instanceof TallyStore)
         return ((TallyStore) tallyi).covariance ((TallyStore) tallyj);
      else if (isStable)
         return curSum2[i][j - i - 1]/(n-1);
      else {
         double sum1 = tallyi.sum();
         double sum2 = tallyj.sum();
         double sum12 = sxy[i][j - i - 1];
         return (sum12 - sum1*sum2/n)/(n-1);
      }
   }
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