Computes the interdecile range of an array of values.

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Interdecile Range
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Computes the interdecile range (idr) for an array of values.


$ npm install compute-idr

For use in the browser, use browserify.


To use the module,
var idr = require( 'compute-idr' );

idr( arr, opts )

Computes the interdecile range provided an input array.
var unsorted = [ 8, 2, 3, 9, 5, 1, 4, 10, 7, 0, 6 ];

var r = idr( unsorted );
// returns 8

If the input array is already sorted in ascending order, set the sorted flag to true.
var sorted = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];

var r = idr( sorted, {'sorted': true} );
// returns 8

Additional options are the same as for the quantile module.


var data = new Array( 100 );

for ( var i = 0; i < data.length; i++ ) {
    data[ i ] = Math.round( Math.random()*100 );

console.log( idr( data ) );

To run the example code from the top-level application directory,
$ node ./examples/index.js


If the input array is not sorted in ascending order, the function is O( N log( N ) ). If the input array is sorted, the function is O(1).



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


MIT license.


Copyright © 2014. Rebekah Smith.