The constant sum question is useful for discovering hidden preferences among respondents as it “forces” respondents to allocate points to each item listed.
Constant sum question outputs
Constant sum questions produce the following outputs:
- Descriptive statistics for number of options for which values were entered including minimum, mean, median, mode, maximum, and standard deviation.
- A table of correlations between each option
- The number of participants who saw the question.
Setting up a constant sum question
Follow these steps to set up a constant sum question:
1. Add question
Navigate to the Add questions tab and click on the button at the bottom of the page.
On the Add or import questions pop-out, select the Add a new question tab and click on the question card to add it to the experiment.
2. Edit question options
Once you add the question, you can adjust the following settings:
- Insert the question text in the text box. You can also include formatting and images.
- Edit the running total label.
- Edit the sum total label.
- Specify the sum total available for allocation.
- To change the row text, edit the text box next to each row. To add formatting or images, click on the settings for that row. Then check the “Add fancy formatting and pictures to row” checkbox. You can then add formatting or images to the row.
- Click on to add additional options.
- You can also add an Other option by clicking the . Respondents who select this option will be prompted to type in their answers.
- Tick the required question? checkbox if you would like respondents to answer this question before proceeding further.
When should I use a constant sum question?
You should use a constant sum question when:
- You have a list of features (not more than 5) to prioritise
- When the features are conceptually easy to understand
- It is not the main objective of your study
If the main objective of your study is to identify and prioritise features of your product, we would recommend to use Generic Conjoint instead.