Iris

Edgar Anderson's iris data.

Installation

$ npm install datasets-iris

For use in the browser, use browserify.

Usage

var data = require( 'datasets-iris' );

data.setosa

Edgar Anderson's data for Iris setosa.

console.log( data.setosa );
/* returns
	{
		'sepal': {
			'len': [...],
			'width': [...]
		},
		'petal': {
			'len': [...],
			'width': [...]
		}
	}
*/

data.versicolor

Edgar Anderson's data for Iris versicolor.

console.log( data.versicolor );
/* returns
	{
		'sepal': {
			'len': [...],
			'width': [...]
		},
		'petal': {
			'len': [...],
			'width': [...]
		}
	}
*/

data.virginica

Edgar Anderson's data for Iris virginica.

console.log( data.virginica );
/* returns
	{
		'sepal': {
			'len': [...],
			'width': [...]
		},
		'petal': {
			'len': [...],
			'width': [...]
		}
	}
*/

Examples

var toMatrix = require( 'compute-to-matrix' ),
	mean = require( 'compute-mean' ),
	variance = require( 'compute-variance' ),
	data = require( 'datasets-iris' );


var submat,
	mat,
	mu,
	s2;

// Create one large matrix containing all iris data...
mat = toMatrix([
	data.setosa.sepal.len,
	data.setosa.sepal.width,
	data.setosa.petal.len,
	data.setosa.petal.width,
	data.versicolor.sepal.len,
	data.versicolor.sepal.width,
	data.versicolor.petal.len,
	data.versicolor.petal.width,
	data.virginica.sepal.len,
	data.virginica.sepal.width,
	data.virginica.petal.len,
	data.virginica.petal.width
]);

// Calculate sample statistics for the various features across species...

// Sepal lengths:
submat = mat.sget( '::4,:' );

mu = mean( submat );
console.log( 'Sepal length means: %s', mu.toString() );

s2 = variance( submat );
console.log( 'Sepal length variances: %s', s2.toString() );

// Sepal widths:
submat = mat.sget( '1::4,:' );

mu = mean( submat );
console.log( 'Sepal width means: %s', mu.toString() );

s2 = variance( submat );
console.log( 'Sepal width variances: %s', s2.toString() );

// Petal lengths:
submat = mat.sget( '2::4,:' );

mu = mean( submat );
console.log( 'Petal length means: %s', mu.toString() );

s2 = variance( submat );
console.log( 'Petal length variances: %s', s2.toString() );

// Petal widths:
submat = mat.sget( '3::4,:' );

mu = mean( submat );
console.log( 'Petal width means: %s', mu.toString() );

s2 = variance( submat );
console.log( 'Petal width variances: %s', s2.toString() );

To run the example code from the top-level application directory,

$ node ./examples/index.js

References

• Anderson, Edgar (1935). "The irises of the Gaspe Peninsula," Bulletin of the American Iris Society, 59, 2–5.
• Fisher, Ronald A. (1936). "The use of multiple measurements in taxonomic problems." Annals of Eugenics, 7, Part II, 179–188.

See Also

• iris-setosa
• iris-versicolor
• iris-virginica

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

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License

MIT license.

Copyright

Copyright © 2015. The Compute.io Authors.