Marketing - MaxDiff - Diagnostic - Posterior Intervals Plot

Takes a MaxDiff hierarchical Bayes output created from Marketing - MaxDiff - Hierarchical BayesMaxDiff hierarchical Bayes and produces posterior intervals of the mean and standard deviation parameters for the distribution from which individual coefficients are sampled. For more information on how to interpret this output, see this blog post.

Example

Technical details

Whenever hierarchical Bayes analysis is run with multiple classes, an attempt will be made to match class labels between chains (note that it is often not possible to match class labels). If this succeeds, or if only one chain was specified, one set of mean and standard deviation parameters will be shown for each class. If this attempt is unsuccessful, the posterior intervals will not be able to be displayed.

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");

const menu_location = "Marketing > MaxDiff > Diagnostic > Posterior Intervals Plot";
if (Q.fileFormatVersion() <= 17.09)
{
    const menu_location = "Marketing > MaxDiff > Diagnostic > Posterior Intervals Plot";
    createDiagnosticROutputFromSelection(menu_location);
} else
{
    // Preferentially, we use appendStandardR because it gives
    // a blank output if selected item is not appropriate instead of an error msg
    // and allows user to change the input choice model

    var selected_items = project.report.selectedRaw();
    var selected_item = selected_items[0];
    var selected_group = selected_item.type == "ReportGroup" ? selected_item : selected_item.group;
    var plot = selected_group.appendStandardR("Marketing - MaxDiff - Posterior Intervals Plot", { "formInput": selected_item.guid});
    project.report.setSelectedRaw([plot]);
}

Acknowledgements

Uses the rstan R package.