Choice Modeling - Save Variable(s) - Class Membership

Save a variable to the data set containing class membership (i.e., the class with the highest posterior probability of class membership for the case)

Create a new variable which contains the class for each respondent based on a Choice Modeling - Latent Class Analysis output.

Output

Running this QScript will produce a new variable, which will appear in your data set for use in further analyses.

Technical details

Each respondent has a probability of being in each class. You can determine these probabilities by using Choice Modeling - Save Variable(s) - Class Membership Probabilities, and looking at the RAW DATA. The new variable generated by this script assigns each respondent to the class with the largest probability of membership.

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");
 
main();
 
function main() {
    var selected_item = getSelectedROutputFromPage([]);
    var expected_class = selected_item !== null &&
                         selected_item.outputClasses.indexOf("FitChoiceLCA") == -1 &&
                         selected_item.data.get("algorithm")[0] == "LCA"  ? "FitChoice" : "FitChoiceLCA";

    saveVariables("Class memberships", "Latent Class Choice Model", 
    "input.choicemodel = ", 
    "\nif (is.null(input.choicemodel$lca.data)) stop()\n"
    + "flipChoice::Memberships(input.choicemodel)", "Pick One", null, "cls.memb", expected_class);
}