A question about Constant Sum | XM Community
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Dear members of the Qualtrics community,
I want to ask you for advice on how to auto calculate the user option in the constant sum.
Example:
For this question, I would like to this question can auto calculate the total from the other question.
I am sorry, I am new in qualtrics and I am not familiar with JavaScript.
Really thanks for your help.
Screenshot 2021-07-21 at 10.39.36.png

Assuming we want to add the validation such that the total of this question matches with the total of some other question: In this case, we can add math operation in custom validation


https://community.qualtrics.com/XMcommunity/discussion/comment/39208#Comment_39208Really thanks for your help. I am sorry and I am so confused about how to use the custom validation.
May I know where can find the user guide for the custom validation?
Many thanks.🙇‍♂️


Qualtrics has not created a support page for this specific use case. Check out this support page on Math operations: https://www.qualtrics.com/support/survey-platform/survey-module/editing-questions/piped-text/math-operations/
Once you have your math operations set, you can then use it in Custom Validation in the Constant Sum question: https://www.qualtrics.com/support/survey-platform/survey-module/editing-questions/piped-text/math-operations/


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