Changeset 1549

Timestamp:

04/10/09 15:21:06 (15 years ago)

Author:

abeham

Message:

Fixed a small bug in the MannWhitneyWilcoxonTest (#573)

Location:

trunk/sources/HeuristicLab.StatisticalAnalysis/3.2

Files:

• MannWhitneyWilcoxonTest.cs (modified) (2 diffs)
• MannWhitneyWilcoxonTestControl.cs (modified) (1 diff)

trunk/sources/HeuristicLab.StatisticalAnalysis/3.2/MannWhitneyWilcoxonTest.cs

@@ -234 +234 @@
           }
           p2Idx++;
-          R1 += (i - starti + 1) * commonRank / (rank - startRank + 1);
+          R1 += (double)((i - starti + 1) * commonRank) / (double)(rank - startRank + 1);
         } else {
           p2Idx++;
@@ -281 +281 @@
           }
           p2Idx++;
-          R1 += (i - starti + 1) * commonRank / (rank - startRank + 1);
+          R1 += (double)((i - starti + 1) * commonRank) / (double)(rank - startRank + 1);
         } else if (p1[i] < p2[p2Idx]) {
           R1 += rank;

trunk/sources/HeuristicLab.StatisticalAnalysis/3.2/MannWhitneyWilcoxonTestControl.cs

@@ -65 +65 @@
       double[] p2 = ConvertStringToArray(p2TextBox);
       if (p1.Length < 10 || p2.Length < 10) {
-        MessageBox.Show("Sample size is too small to approximate, provide at least 10 samples in each population.");
-        return;
+        MessageBox.Show("Caution: Sample size is too small for good approximation, treat the results carefully. Provide at least 10 samples in each population.");
       }
       double alpha = Double.Parse(alphaTextBox.Text);
       double pVal = MannWhitneyWilcoxonTest.TwoTailedTest(p1, p2);
       if (pVal <= alpha) {
-        resultLabel.Text = "The hypothesis H0 can be rejected at " + alpha.ToString() + ", the p-Value is " + pVal.ToString() + "\nThe samples are likely not to stem from the same distribution.";
+        resultLabel.Text = "The hypothesis H0 can be rejected at " + alpha.ToString() + ", the approximated p-Value is " + pVal.ToString() + "\nThe samples are not likely to stem from the same distribution.";
       } else {
         resultLabel.Text = "The hypothesis H0 cannot be rejected at " + alpha.ToString();