# Choice Modeling - Save Variable(s) - Utilities (Min 0)

Save variables that contain utilities scaled to have a minimum of 0 (within each attribute)

Create new variables which contain the utilities from a Choice Modeling - Latent Class Analysis, Choice Modeling - Hierarchical Bayes or Choice Modeling - Ensemble of Models output.

Utilities are the individual-level coefficients shifted so that, for each individual and attribute, the lowest utility of any level is zero.

Individual-level coefficients are not able to be saved to variables for models with simulated data and models created using a CHO data file where respondent IDs were not specified.

If the choice model contains a "None of these" alternative, the utility of the "None of these" parameter will need to be adjusted in order to take into account the changes made to the utilities of the other attributes. For example, if there are 3 attributes in the model (not including the Alternative attribute), and their utilities needed to be shifted by +0.3, -0.5, +0.8 respectively, then the "None of these" utility will need to be shifted by +0.6 (= 0.3 - 0.5 + 0.8), in addition to any shifting done as part of the Alternative attribute.

## Output

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

## References

McLean, M. W. (2018, July 24). How to Use Hierarchical Bayes for Choice Modeling in Displayr [Blog post]. Accessed from https://www.displayr.com/how-to-hierarchical-bayes-choice-model-displayr/.

## 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.

• 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

• 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');

saveVariables('Utilities (min 0)', 'Latent Class Analysis, Hierarchical Bayes or Ensemble Choice Model',
'input.choicemodel = ',
'\nif (!is.null(input.choicemodel\$simulated.respondent.parameters)) stop()\n' +
'flipChoice::Utilities(input.choicemodel, scaling = "Min = 0", attr.order = "As is", output = "Data")',
null, null, 'util.min0', ['FitChoice', 'ChoiceEnsemble']);