[Charts](https://oods-foundry.com/charts) / Heatmap

# Heatmap

Rendered from sample rows by viz_render in OODS Foundry 0.10.1, in each theme.

Generated from @oods/foundry 0.10.1

Each chart is drawn live in your browser from the spec viz_render returned with it, so you can point at its marks. The SVG viz_render returned is the record: its hash is under each chart, and it shows where a live drawing would differ from it.

## `pattern:viz:correlation-matrix`

![Usage and retention correlate strongly, while support tickets are inversely related to every metric.](https://oods-foundry.com/charts/svg/correlation-matrix-light.svg)

light `sha256:de6a32e63147…`drawn live from its spec

![Usage and retention correlate strongly, while support tickets are inversely related to every metric.](https://oods-foundry.com/charts/svg/correlation-matrix-dark.svg)

dark `sha256:5b076b9320f0…`drawn live from its spec

![Usage and retention correlate strongly, while support tickets are inversely related to every metric.](https://oods-foundry.com/charts/svg/correlation-matrix-hc.svg)

high contrast `sha256:dc95ce083313…`drawn live from its spec

## `pattern:viz:time-grid-heatmap`

![Lunch blocks mid-week trend hottest, with lighter mornings and Friday tapering off.](https://oods-foundry.com/charts/svg/time-grid-heatmap-light.svg)

light `sha256:6deab9d419bd…`drawn live from its spec

![Lunch blocks mid-week trend hottest, with lighter mornings and Friday tapering off.](https://oods-foundry.com/charts/svg/time-grid-heatmap-dark.svg)

dark `sha256:8bdba04d0168…`drawn live from its spec

![Lunch blocks mid-week trend hottest, with lighter mornings and Friday tapering off.](https://oods-foundry.com/charts/svg/time-grid-heatmap-hc.svg)

high contrast `sha256:a1d5970861cb…`drawn live from its spec

## Certified: 4 results

`artifact_certify` on `correlation-matrix`, drawn in light: coverage `certified`, conformant `true`.

- accessibility equivalence `a11yEquivalence`

  `pass`

- determinism `determinism`

  `pass`

- contrast `contrast`

  `unchecked`

- accuracy `accuracy`

  `pass`

**Contrast:** No gradeable OODS series paint: the compiled spec has no color encoding or OODS mark color, or none of its series paints rendered — author-decorative colors are skipped as chrome. certify grades the series-to-paint assignment of the rendered chart (the compiled spec rendered through @oods/viz-render), against the requested CSS scope canvas. Scope: light/A.

### Its narrative

Expansion tracks with usage/retention, support ticket volume is the only negative driver.

- Usage↔Retention correlation = 0.78
- Support inverse relationship is strongest vs usage

### Its data table

Correlation coefficients

| Metric | Metric | Correlation |
| - | - | - |
| Usage | Usage | 1 |
| Usage | Retention | 0.78 |
| Usage | Expansion | 0.46 |
| Usage | Support | -0.32 |
| Retention | Usage | 0.78 |
| Retention | Retention | 1 |
| Retention | Expansion | 0.54 |
| Retention | Support | -0.28 |
| Expansion | Usage | 0.46 |
| Expansion | Retention | 0.54 |
| Expansion | Expansion | 1 |
| Expansion | Support | -0.12 |
| Support | Usage | -0.32 |
| Support | Retention | -0.28 |
| Support | Expansion | -0.12 |
| Support | Support | 1 |

Certification covers charts only: it measures the chart's specification. A pass means no offered rule found a problem, not a general promise. An ECharts type certifies only when its data is supplied.

The call

```
{
  "brand": "A",
  "theme": "light",
  "spec": { … the normalized spec viz_render returned … }
}
```