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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](/intermediate-editor/transform).

## Transform to sum

Say the underlying values in **S10v1** are "0" or "1", representing "No" or "Yes" respectively. You can [Transform](/intermediate-editor/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.

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