Occurrence Matrix

Context

The Occurrence Matrix graph displays a two-dimensional table of the selected variables plus the statistics of the corresponding independence test.

Usage

• You can access the Occurrence Matrix function in multiple ways:
  • Main Menu > Data > Charts > Occurrence Matrix.
  • Node Context Menu > Charts > Occurrence Matrix.
• In the Parameter panel, select any of the available variables from the dropdown lists:
  • Select the Row Variable.
  • Select the Column Variable.
• If you had nodes selected when you opened the Charts window, the variables in the dropdown menus are restricted to that selection.
• Check one of the following options:
  • Absolute.
  • Percent.
  • Row Percent.
  • Column Percent.
• If a learning/test split is defined, you can also specify which subset to use.
• Click Show to produce the chart.

• The right panel contains all the information about the χ² test or G-test, plus the computed degrees of freedom.
  • You can choose the type of independence test, G or χ², under Main Menu > Window > Preferences > Tools > Statistical Tools.
  • Note that Missing Values are not taken into account for the independence test, but Weights are.

Workflow Animation