# Matrix Reports

Source: https://sites.veevavault.help/gr/sitevault/studies/matrix-reports/

## Overview

When building a matrix report, you select grouping fields for both the rows and columns. You also select a calculation for Vault to perform in the union of each row and column.

## Selecting Grouping Fields

Select fields from the Group columns by and Group rows by dropdown lists.

## Defining Summary Calculations

By default, a matrix report counts the number of records that match the criteria defined by the column and row fields. To use a different calculation, select a function from the picklist in the cell. When choosing a summary calculation other than Count, select a numeric, date, or ID field on which to perform the calculation. You must add grouped rows to your report before adding summary calculations.