This article describes how to change the base of a multiple response variable set, also known as a binary-multi.

The sample size is worked out based on the number of respondents who have data for the question. Any respondent with missing data for an option will be excluded from the sample for that option.

For instance, this table is based on those who have answered the question:

This table is based on everyone in the study, which includes missing data for this question:

## Requirements

A *binary-multi* variable set that includes *missing data*.

## Method

- Select a binary-multi variable set in the
**data sets**tree. - In the
**object inspector**to the right, click**DATA VALUES > Missing values.** - For
**Missing data**, choose**Missing Values >****Include in analyses**and click**OK**.

## Next

How to Set Value Attributes for a Binary-Multi and Binary-Grid

How to Rebase Multiple Response Data in Variable(s) to NET

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