Box plot

Use a box plot when median and spread matter more than the mean, compared across categories.

Response latency by region (ms)

This chart cannot be displayed here: it needs JavaScript and WebGL.

12 observations · box = middle half, line = median

The same chart in each style

Source

Rich Markdown

```chart
type: boxplot
title: Response latency by region (ms)
data:
  inline:
    - { region: eu, ms: 142 }
    - { region: eu, ms: 168 }
    - { region: eu, ms: 185 }
    - { region: eu, ms: 211 }
    - { region: eu, ms: 240 }
    - { region: eu, ms: 268 }
    - { region: us, ms: 118 }
    - { region: us, ms: 128 }
    - { region: us, ms: 141 }
    - { region: us, ms: 165 }
    - { region: us, ms: 189 }
    - { region: us, ms: 221 }
encoding: { x: region, y: ms }
```

Fields that matter

type: boxplot with numeric encoding.y and optional categorical encoding.x
Without encoding.x, one box covers all observations
encoding.color and encoding.facet split boxes and panels
Quartiles use R-7 interpolation; whiskers end at the most extreme observed values within 1.5 IQR
Observations beyond the fences are drawn individually
style.orientation is auto (default), vertical or horizontal

Interactions

Hover or focus a box to read its derived summary, kept separate from individual outliers.
Scroll a long readout with the pointer or Page Up and Page Down while the chart has focus.
Open the Table view, Download PNG or CSV, or Expand the chart.