---
title: "Old Faithful: eruptions and waits"
styles: [scientific]
---

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Old Faithful observations pair eruption duration with waiting time. Their two clusters are a useful reminder to inspect a distribution before reducing it to one average.

```chart
{
  "axes": {
    "x": {
      "label": "Waiting time",
      "unit": "min"
    },
    "y": {
      "label": "Eruption duration",
      "unit": "min"
    }
  },
  "data": {
    "csv": "gallery/same-numbers/data/old-faithful.csv"
  },
  "encoding": {
    "x": "waiting_min",
    "y": "eruption_min"
  },
  "title": "Longer eruptions accompany longer waits",
  "type": "scatter"
}
```

## Source

````rmd
---
title: "Old Faithful: eruptions and waits"
styles: [scientific]
---

```chart
{
  "axes": {
    "x": {
      "label": "Waiting time",
      "unit": "min"
    },
    "y": {
      "label": "Eruption duration",
      "unit": "min"
    }
  },
  "data": {
    "csv": "data.csv"
  },
  "encoding": {
    "x": "waiting_min",
    "y": "eruption_min"
  },
  "title": "Longer eruptions accompany longer waits",
  "type": "scatter"
}
```

````

## Data and credits

[Complete report and provenance](https://richview.ai/docs/gallery/same-numbers/) · [Rich Markdown source](https://richview.ai/examples/charts/old-faithful/report.rmd) · [CSV observations](https://richview.ai/docs/gallery/same-numbers/data/old-faithful.csv).