Radar chart

Use a radar chart to compare groups across a handful of measures that share a scale.

Source

```chart
type: radar
title: Beta is steadier and cheaper, Alpha is faster
subtitle: Score per skill and team
data:
  inline:
    - {skill: Speed, team: Alpha, score: 80}
    - {skill: Reliability, team: Alpha, score: 65}
    - {skill: Cost, team: Alpha, score: 40}
    - {skill: Docs, team: Alpha, score: 70}
    - {skill: Support, team: Alpha, score: 55}
    - {skill: Speed, team: Beta, score: 50}
    - {skill: Reliability, team: Beta, score: 90}
    - {skill: Cost, team: Beta, score: 75}
    - {skill: Docs, team: Beta, score: 45}
    - {skill: Support, team: Beta, score: 85}
encoding: {x: skill, y: score, color: team}
axes:
  y: {label: Score}
```

Fields that matter

• type: radar with encoding.x for the axis (spoke) name, encoding.y for the value and encoding.color for one polygon per group
• At least three axes are needed, and a repeated axis is rejected
• A missing value breaks the polygon at its spoke and is disclosed; it is never joined across
• All spokes share one scale; axes.y sets label, format, unit, min and max, and values outside a fixed scale are drawn at its edge and counted
• encoding.facet makes one radar per value; style.ratio sets the width to height ratio and style.facet_scale: free gives each facet its own scale

Interactions

• Hover or focus a point to read its value; the pointer picks the nearest point within reach.
• Click a legend entry to toggle a series when the chart has several.
• Open the Table view, Download PNG or CSV, or Expand the chart.