Building Data Mining Tools Using JDM - Java Data Mining: Strategy, Standard, and Practice - page 354

15. if (mAttributeStatisticsSet null) {

16. JOptionPane.showMessageDialog(

17. this,

18. "No Statistics Available",

19. "Null Statistics",

20. JOptionPane.WARNING_MESSAGE);

21. return;

22. }

23. mStatistics mAttributeStatisticsSet.getStatistics();

24. } catch (JDMException lException) {

25. JOptionPane.showMessageDialog(

26. this,

27. lException.getMessage(),

28. "JDMException",

29. JOptionPane.WARNING_MESSAGE);

30. lException.printStackTrace();

31. return;

32. }

33. if (mStatistics null) {

34. JOptionPane.showMessageDialog(

35. this,

36. "Descriptive Statistics not supported",

37. "JDM",

38. JOptionPane.WARNING_MESSAGE);

39. return;

40. }

41. …
42. }

In this example, we removed the code dealing with graphical ini-
tialization. After the graphical component is created, the member
variable mStatistics holds the collection of all attribute statistics. The
code removed (noted by an ellipsis, …) around line 41 contains
graphical initialization as well as the following lines, which are also
activated whenever the user selects a new attribute:

1. String lVarName (String) mVariableList.getSelectedValue();

2. UnivariateStatistics lStats

3. mAttributeStatisticsSet.getStatistics(lVarName);

4. mSelectedContinuousStatistics lStats.getContinuousStatistics();

5. ((AbstractTableModel) mContinuousStatisticsTable.getModel()).

6. fireTableDataChanged();

7. mSelectedDiscreteStatistics lStats.getDiscreteStatistics();

8. updateDiscreteStatistics();

9. mSelectedNumericalStatistics lStats.getNumericalStatistics();

10. updateNumericalStatistics();

In line 3, the statistics of the selected attribute are retrieved and
then the three kinds of statistics (continuous, discrete, and numerical)