npm package: @stdlib/datasets-anscombes-quartet
Description: Anscombe's quartet.
Author: The Stdlib Authors
Latest version: 0.2.3

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# Anscombe's Quartet

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> [Anscombe's quartet][anscombes-quartet].

<section class="intro">

[Anscombe's quartet][anscombes-quartet] is a set of `4` datasets which all have nearly identical simple statistical properties but vary considerably when graphed. [Anscombe][francis-anscombe] created the datasets to demonstrate why graphical data exploration should **precede** statistical data analysis and to show the effect of outliers on statistical properties.

</section>

<!-- /.intro -->

<section class="installation">

## Installation

```bash
npm install @stdlib/datasets-anscombes-quartet
```

</section>

<section class="usage">

## Usage

```javascript
var data = require( '@stdlib/datasets-anscombes-quartet' );
```

#### data()

Returns [Anscombe's quartet][anscombes-quartet], which is comprised of `4` individual datasets, where each individual dataset is an `array` of `[x,y]` tuples.

```javascript
var d = data();
/* returns
    [
        [
            [ 10, 8.04 ],
            [ 8, 6.95 ],
            [ 13, 7.58 ],
            [ 9, 8.81 ],
            [ 11, 8.33 ],
            [ 14, 9.96 ],
            [ 6, 7.24 ],
            [ 4, 4.26 ],
            [ 12, 10.84 ],
            [ 7, 4.82 ],
            [ 5, 5.68 ]
        ],
        [
            [ 10, 9.14 ],
            [ 8, 8.14 ],
            [ 13, 8.74 ],
            [ 9, 8.77 ],
            [ 11, 9.26 ],
            [ 14, 8.1 ],
            [ 6, 6.13 ],
            [ 4, 3.1 ],
            [ 12, 9.13 ],
            [ 7, 7.26 ],
            [ 5, 4.74 ]
        ],
        [
            [ 10, 7.46 ],
            [ 8, 6.77 ],
            [ 13, 12.74 ],
            [ 9, 7.11 ],
            [ 11, 7.81 ],
            [ 14, 8.84 ],
            [ 6, 6.08 ],
            [ 4, 5.39 ],
            [ 12, 8.15 ],
            [ 7, 6.42 ],
            [ 5, 5.73 ]
        ],
        [
            [ 8, 6.58 ],
            [ 8, 5.76 ],
            [ 8, 7.71 ],
            [ 8, 8.84 ],
            [ 8, 8.47 ],
            [ 8, 7.04 ],
            [ 8, 5.25 ],
            [ 19, 12.5 ],
            [ 8, 5.56 ],
            [ 8, 7.91 ],
            [ 8, 6.89 ]
        ]
    ]
*/
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- TODO: more interesting example involving stats and plotting once ndarray -->

<!-- eslint no-undef: "error" -->

```javascript
var data = require( '@stdlib/datasets-anscombes-quartet' );

console.log( data() );
```

</section>

<!-- /.examples -->



* * *

<section class="references">

## References

-   Anscombe, Francis J. 1973. "Graphs in Statistical Analysis." _The American Statistician_ 27 (1). \[American Statistical Association, Taylor & Francis, Ltd.]: 17–21. <http://www.jstor.org/stable/2682899>.

</section>

<!-- /.references -->

<!-- <license> -->

## License

The data files (databases) are licensed under an [Open Data Commons Public Domain Dedication & License 1.0][pddl-1.0] and their contents are licensed under [Creative Commons Zero v1.0 Universal][cc0]. The software is licensed under [Apache License, Version 2.0][apache-license].

<!-- </license> -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

## See Also

-   <span class="package-name">[`@stdlib/datasets-anscombes-quartet-cli`][@stdlib/datasets-anscombes-quartet-cli]</span><span class="delimiter">: </span><span class="description">CLI package for use as a command-line utility.</span>


</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[anscombes-quartet]: https://en.wikipedia.org/wiki/Anscombe%27s_quartet

[francis-anscombe]: https://en.wikipedia.org/wiki/Francis_Anscombe

</section>

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