# Visualization - Distributions - Box

A box plot is used to compare the distributions of different groups

*Box plots*, also known as *box-and-whisker plots*
are used to compare the distributions of different groups. The range of the box indicates the interquartile range of the data and the central line denotes the median (i.e. five-number summary).

## Example

The example below uses data from a fast-food tracking study. The box plot shows the distribution of fast food consumed for different age groups.

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### Create a Box Plot in Displayr

- 1. Go to
**Insert > Visualization > Box Plot** - 2. Under
**Inputs > DATA SOURCE > Variables in ‘Data’**, select the variable you want to examine - 3. Under
**Inputs > DATA SOURCE > Groups**, select the variable to split your data

## Object Inspector Options

The following is an explanation of the options available in the Object Inspector for this specific visualization. Refer to Visualization Options for general chart formatting options.

### Chart

**APPEARANCE****Plot vertically**Rotates the plot by 90 degrees.

**Data value color**Sets the color of the*Box points*as described below.

**Box points**Treatment of*outliers*:**All**plots all of the values, next to the boxes.**Suspected outliers**plots all the unique values that appear outside the*whiskers*, using hollow circles for points less than 3 times the interquartile range from the 1st and 3rd quartiles.**Outliers**plots all the unique values that appear outside the*whiskers*.

Note that the quantiles and median shown in the box plot can differ from those shown in the violin plot. Quantiles in the box plot are computed using the midpoints between the steps of the empirical cdf as knots. This is equivalent to `quantile(x, type = 5)` in R, or Method 10 in http://jse.amstat.org/v14n3/langford.html.

# More Information

## Acknowledgements

The density is computed using the base R `density` function and the plot is created using `plotly`.

## Code

Visualization - Distributions - Histogram

```
{
"formChartType": "Box",
"formStackSeries": false,
"formSmallMultiples": false,
"formAsPercentages": false,
"formScatterLabelType": "As hover text"
}
```