Interval chart

Use an interval chart to show a range per category, such as a forecast, a confidence interval or a planned range.

Source

```chart
type: interval
title: Quarterly revenue forecast range
subtitle: Authored lower/upper bounds; dots show the point estimate
data:
  inline:
    - { quarter: "Q1", lower: 1.2, upper: 1.6, estimate: 1.4 }
    - { quarter: "Q2", lower: 1.5, upper: 2.0, estimate: 1.75 }
    - { quarter: "Q3", lower: 1.7, upper: 2.4, estimate: 2.05 }
    - { quarter: "Q4", lower: 2.0, upper: 2.9, estimate: 2.45 }
encoding: { x: quarter, lower: lower, upper: upper, y: estimate }
axes: { y: { label: Revenue (CZK m) } }
```

Fields that matter

• type: interval with categorical encoding.x
• encoding.lower and encoding.upper are the required numeric bounds
• encoding.y optionally supplies a point estimate
• encoding.color and encoding.facet split groups and panels
• axes.y.label, format and unit describe the value axis
• style.orientation is auto (default), vertical or horizontal
• Each category and color pair supplies exactly one interval; lower must not exceed upper

Interactions

• Hover or focus an interval to read its lower and upper bounds separately, with the estimate if given.
• Open the Table view, Download PNG or CSV, or Expand the chart.