Computing the Statistic

  1. To compute the significance value, from the menus choose:

    Transform > Compute Variable...

    Figure 1. Compute Variable main dialog box
    Compute Variable main dialog box
  2. In the Compute Variable dialog, enter p_mh as the target variable.
  3. Type 1 - CDF.CHISQ(47.15,3) as the expression.
  4. Click OK.
Figure 2. Dataeditor with p-value for marginal homogeneity test
Dataeditor with p-value for marginal homogeneity test

The significance value is near 0.0; thus you must reject the marginal homogeneity model, and there was a statistically significant change in voter preference after the debate.

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