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Ordinal Regression using SPSS Statistics (cont...)

Procedure II – Running the PLUM Procedure

The instructions below show you how to run the PLUM procedure. Some of this will require using syntax, but we explain what you need to do. This step produces some of the main results for your ordinal regression analysis, including predicted probabilities, amongst other useful statistical measures we discuss in the Interpretation and Reporting section later.

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SPSS Statistics

Procedure III – Outputting the PLUM parameters estimates using OMS

Now that you have run the PLUM procedure, you can go back to the OMS control panel and get SPSS Statistics to output the file containing the Parameter Estimates table's information that has been stored in memory.

SPSS Statistics

Procedure IV – Saving the newly-created file

If you have followed the procedure above, you will not only have generated the output in the usual way (i.e., in the Output Viewer window), but you will have also created a new SPSS Statistics data file, as shown below:

Published with written permission from SPSS Statistics, IBM Corporation.

This file contains the odds ratios and their 95% confidence intervals, but it is not currently saved. Therefore, save the file by clicking on
File > Save As... on the main menu (as shown below) and saving the file with a name of your choosing in a directory of your choosing (it is saved as plum.sav in this guide).

Published with written permission from SPSS Statistics, IBM Corporation.

Now that you have saved the file, you can add odds ratios to the file. To do this, follow the steps in the next section, Procedure V – Generating odds ratios, on the next page.

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