In Harmoni, you can set a base for an axis, an element, or multiple items. A base applied in the project tree changes the denominator when creating an analysis.

The table and graph percentages will then be calculated on this applied base and the respondents filtered on the same applied base.

- Copy and apply a base
- Apply base to standard axes and elements
- Apply base to Grids
- Remove a base
- Save a base

**1. Copy and apply a base**

Instead of using the default Total, the base can be preset with a value. An applied base can be added for the whole axis or different applied bases can be used for each element in the axis.

If they exist, Harmoni will always use the applied base when calculating percentages.

You will first need to select an element or multiple elements in your project tree. The contextual option * copy as base* will be available under

*. Following this, you need to select the item or group of items for which you want to apply the base. The option*

**edit***will be available under*

**apply base***.*

**edit**On clicking **apply base**, the information icon ('i' in a circle) will display next to the item. Hovering on the information icon will show information about the applied base.

In this example, we are using as base respondents whose visit length has been three nights or more.

- Select/copy as a base three elements.
- The contextual option
will be available under**copy as base****edit** - Select the item or group of items for which you want to apply the base. The option
is available under**apply****base**.**edit** - On clicking
**apply base**, the information icon ('i' in a circle) will display next to the item.

**2. Apply base to standard axes and elements**

- Applying a base to an axis applies the same base to all elements.
- Applying a base to an element applies the relevant base to that item.
- You can only apply a base to the axis or the elements but not both.
- Axis base overrides what was set up on at the element level.

**3. Apply base to Grids**

- Applying a base to an axis in a grid applies the same base to all elements for just that axis.
- Applying a base to elements within a grid applies the same base to all axes.
- If a base is applied both to an axis and an element in a grid, the element base overrides what was set on the axis.

**4. Remove a base**

The applied base can be removed using **remove base** option under * edit*.

**5. Save a base**

When auto sync mode is **off**, use **save base** under * edit *to save, and wait to apply all the changes once your work is done. Learn more.

**Where to from here?**

Learn more about applied bases in Analysis.