# Frequently asked questions - Calc

## How to use Data Bar Conditional Formatting

Conditional formatting using a **Data bar** is particularly suitable for providing an immediate visual impact when comparing data. It avoids the need to create a **Bar** chart, while offering the advantage of an *in situ* comparison.

This layout is *conditional*, that is to say that the bar displayed is dependent on the cell value.

This format uses two colors (Light Blue default for "positive" bars and Light Red for "negative" ones).

In addition to the colors you can either keep the calculation Automatic (varies from the minimum value to the maximum value) or choose the method of calculation:

- Min
- Max
- Percentile
^{[1]} - Value
- Percent
- Formula

The choices *Min* and *Max* are sufficient to themselves as found in the range. Other options need to be specified by a value (Percentile, Value, Percentage) or a cell reference or formula (Formula).

The following example illustrates side by side a *Data bar* formatting and a *Bar* chart that could be generated as an alternative way of representing the data:

Note: the data bar "uses" all the width of the column. Re-sizing of bars follow the resizing of the column.

To realize this example, you only need to use the menu entry Format ▸ Conditional Formatting ▸ Data Bar without modifying the default options.

The following example shows the effect with the additional option Format ▸ Conditional Formatting ▸ Data Bar ▸ More options... to remove the vertical axes. The positive and negative values are aligned on the left and only the color allow to differentiate them:

Notes :

- ↑ A percentile is each of the 99 values which divide the sorted data in 100 equal parts, so that each part represents 1/100 of the sample population. A percentile return the value for a data series going from the smallest to the largest value in a set of data. For Alpha = 25, the percentile means the first quartile = 50 Alpha is the MEDIAN.