Running the Analysis

  1. To run a Complex Samples Ordinal Regression analysis, from the menus choose:

    Analyze > Complex Samples > Ordinal Regression...

    Figure 1. Complex Samples Plan dialog box
    Complex Samples Plan dialog box
  2. In the Complex Samples Plan dialog, browse to and select poll.csplan as the plan file. See the topic Sample Files for more information.
  3. Select poll_jointprob.sav as the joint probabilities file.
  4. Click Continue.
    Figure 2. Ordinal Regression dialog box
    Ordinal Regression dialog box
  5. Select The legislature should enact a gas tax as the dependent variable.
  6. Select Age category through Driving frequency (when variables are listed in file order) as factors.
  7. Click Statistics.
    Figure 3. Ordinal Regression Statistics dialog box
    Ordinal Regression Statistics dialog box
  8. In the Statistics dialog, select Classification table in the Model Fit group.
  9. Select Estimate, Exponentiated estimate, Standard error, Confidence interval, and Design effect in the Parameters group.
  10. Select Wald test of equal slopes and Parameter estimates for generalized (unequal slopes) model.
  11. Click Continue.
  12. Click Hypothesis Tests in the Complex Samples Ordinal Regression dialog box.
    Figure 4. Hypothesis Tests dialog box
    Hypothesis Tests dialog box

    Even for a moderate number of predictors and response categories, the Wald F test statistic can be inestimable for the test of parallel lines.

  13. In the Hypothesis Tests dialog, select Adjusted F in the Test Statistic group.
  14. Select Sequential Sidak as the adjustment method for multiple comparisons.
  15. Click Continue.
  16. Click Odds Ratios in the Complex Samples Ordinal Regression dialog box.
    Figure 5. Ordinal Regression Odds Ratios dialog box
    Ordinal Regression Odds Ratios dialog box
  17. In the Odds Ratios dialog, choose to produce cumulative odds ratios for Age category and Driving frequency.
  18. Select 10-14,999 miles/year, a more "typical" yearly mileage than the maximum, as the reference category for Driving frequency.
  19. Click Continue.
  20. Click OK in the Complex Samples Ordinal Regression dialog box.

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