Marketing - MaxDiff - Save Variable(s) - Class Membership Probabilities

Create new variables which contain the probabilities of respondents belonging to each class, from a MaxDiff latent class analysisMaxDiff latent class analysis output. You should select the output before running this script.

Example

The script produces a SUMMARY table with the new variables:

How to apply this QScript

Start typing the name of the QScript into the Search features and data box in the top right of the Q window.
Click on the QScript when it appears in the QScripts and Rules section of the search results.

OR

Select Automate > Browse Online Library.
Select this QScript from the list.

Customizing the QScript

This QScript is written in JavaScript and can be customized by copying and modifying the JavaScript.

Customizing QScripts in Q4.11 and more recent versions

Start typing the name of the QScript into the Search features and data box in the top right of the Q window.
Hover your mouse over the QScript when it appears in the QScripts and Rules section of the search results.
Press Edit a Copy (bottom-left corner of the preview).
Modify the JavaScript (see QScripts for more detail on this).
Either:
- Run the QScript, by pressing the blue triangle button.
- Save the QScript and run it at a later time, using Automate > Run QScript (Macro) from File.

Customizing QScripts in older versions

Copy the JavaScript shown on this page.
Create a new text file, giving it a file extension of .QScript. See here for more information about how to do this.
Modify the JavaScript (see QScripts for more detail on this).
Run the file using Automate > Run QScript (Macro) from File.

JavaScript

includeWeb('QScript R Output Functions');

classMembershipProbabilitiesMaxDiff();

function classMembershipProbabilitiesMaxDiff() {

    let selected_item = getSelectedROutputFromPage([]);

    if (selected_item == null) {
        log("The selected item is not valid. You should calculate it again before running this option.");
        return false;
    }

    let expected_class = getExpectedClassForMaxDiff(selected_item);

    saveVariables('Class membership probabilities', 'MaxDiff latent class analysis',
              'input.maxdiff = ',
              '\nif (!is.null(input.maxdiff$covariates.notes))\n' +
              '    stop("Class membership probabilities are not available for varying coefficients outputs.")\n' +
              'probs = input.maxdiff$posterior.probabilities\n' +
              'colnames(probs) = paste0("Class ", 1:ncol(probs))\n' +
              'probs', null, null, 'cls.memb.prob', expected_class);

}