With "Check all that apply" questions, it may be helpful to count how many options respondents checked "Yes" for. Below, we have have a question **S10v1** and child elements representing different products. A simple way to count the number of products selected is to use Protobi's Transform.

## Transform to sum

Say the underlying values in **S10v1** are "0" or "1", representing "No" or "Yes" respectively. You can Transform to "sum" to count the number of options that were selected.

Below is the distribution after S10v1 was transformed to sum, and child elements were hidden.

## Exclude an option from the count

Using **S10v1** as an example, you may want to exclude certain options from the count. Say you do not want to include "Yes" values from **Other** in the count. From **S10v1's **context menu, choose "More properties..." and remove the child element.