Takes an array of numbers and calculates some descriptive statistics. 

Takes an array of numbers and calculates some descriptive statistics

andreasmadsen

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  "description": "Takes an array of numbers and calculates some descriptive statistics",

  "author": "Andreas Madsen <amwebdk@gmail.com>",

    "url": "git://github.com/AndreasMadsen/summary.git"

> Takes an array of numbers and calculates some descriptive statistics

var data = summary([-1, 0, 1], true /* sorted */);

The `summary` constructor, takes a required `data` array and and optional

boolean indication whether or not the `data` is `sorted` from small to big,

// Data is sorted, but summary dosn't know. Works fine just a bit slower.

var data = summary([-1, 0, 1] /*, default false */);

var data = summary([1, 0, -1] /*, default false */);

var data = summary([0, 1, -1] /*, default false */);

The data object has the following metods, note that almost all values is lazy

data.quartile(0.25); // Returns 25% quartile

data.sd(); // Returns the standard deviation

> Permission is hereby granted, free of charge, to any person obtaining a copy

> of this software and associated documentation files (the "Software"), to deal

> in the Software without restriction, including without limitation the rights

> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

> copies of the Software, and to permit persons to whom the Software is

> furnished to do so, subject to the following conditions:

> The above copyright notice and this permission notice shall be included in

> all copies or substantial portions of the Software.

> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  if (!(this instanceof Summary)) return new Summary(data, sorted);

    throw TypeError('data must be an array');

// Not all values are in lazy calculated since that wouldn't do any good

    this._data = this._data.sort(function (a, b) { return a - b; });

    for (var i = 0; i < this._length; i++) sum += this._data[i];

    // Count the amount of repeat and update mode variables

    for (var i = 1; i < this._length; i++) {

    this._cache_mean = this.sum() / this._length;

Summary.prototype.quartile = function (prob) {

  if (!this._cache_quartiles.hasOwnProperty(prob)) {

        this._cache_quartiles[prob] = data[0];

        this._cache_quartiles[prob] = data[data.length - 1];

        this._cache_quartiles[prob] = (data[ceil - 1] + data[ceil]) / 2;

      this._cache_quartiles[prob] = data[ceil - 1];

Summary.prototype.variance = function () {

    for (var i = 0; i < this._length; i++) {

      sqsum += (this._data[i] - mean) * (this._data[i] - mean);

    this._cache_variance = sqsum / (this._length - 1);

    this._cache_sd = Math.sqrt(this.variance());

    this._cache_max = this.sort()[this._length - 1];

test('testing sort method', function (t) {

    summary([2, 3, 7, -2, 0, 1, 1], true).sort(),

    summary([2, 3, 7, -2, 0, 1, 1], false).sort(),

    summary([2, 3, 7, -2, 0, 1, 1]).sort(),

test('testing size method', function (t) {

test('testing sum method', function (t) {

test('testing mode method', function (t) {

    summary([10, 11, 12, 11, 12, 7, 12]).mode(),

    summary([10, 13, 12, 13, 12, 13, 12]).mode(),

test('testing mean method', function (t) {

test('testing quartile method', function (t) {

    2, 27, 10, 29, 16, 8, 5, 19, 2, 2, 18,28,

    7, 28, 28, 25, 19, 14, 18, 21, 25, 29, 7,

test('testing median method', function (t) {

test('testing variance method', function (t) {

  t.equal(summary([-2, -1, 0, 1, 2]).variance(), 2.5);

  t.equal(summary([-2, -1, 0, 1, 2]).sd(), Math.sqrt(2.5));

test('testing max method', function (t) {

  t.equal(summary([6, 10, 2, 5]).max(), 10);

test('testing min method', function (t) {

  t.equal(summary([6, 10, 2, 5]).min(), 2);

		{
		"name": "summary",
		"description": "Takes an array of numbers and calculates some descriptive statistics",
		"version": "0.2.0",
		"version": "0.3.0",
		"author": "Andreas Madsen <amwebdk@gmail.com>",
		@@ -6,0 +6,0 @@ "main": "./summary.js",

		@@ -29,4 +29,7 @@ #summary
		// Data is sorted from small to big
		var data = summary([-1, 0, 1], true);
		var data = summary([-1, 0, 1], true);

		// Data is sorted, but summary dosn't know. Works fine just a bit slower.
		var data = summary([-1, 0, 1] /, default false /);

		// Data is sorted in reverse order
		@@ -60,2 +63,5 @@ var data = summary([1, 0, -1] /, default false /);
		data.sd(); // Returns the standard deviation

		data.max(); // Returns the maximum value
		data.min(); // Returns the minimum value
		```
		@@ -62,0 +68,0 @@

		@@ -14,3 +14,3 @@
		this._cache_sum = null;
		this._cache_mode = null;
		this._cache_mode = null;
		this._cache_mean = null;
		@@ -20,2 +20,4 @@ this._cache_quartiles = {};
		this._cache_sd = null;
		this._cache_max = null;
		this._cache_min = null;
		}
		@@ -26,3 +28,3 @@ module.exports = Summary;
		// Not all values are in lazy calculated since that wouldn't do any good
		//
		//
		Summary.prototype.sort = function() {
		@@ -121,3 +123,3 @@ if (this._sorted === false) {
		Summary.prototype.median = function () {
		return this.quartile(0.5);
		return this.quartile(0.5);
		};
		@@ -132,3 +134,3 @@
		}


		this._cache_variance = sqsum / (this._length - 1);
		@@ -147,1 +149,17 @@ }
		};

		Summary.prototype.max = function () {
		if (this._cache_max === null) {
		this._cache_max = this.sort()[this._length - 1];
		}

		return this._cache_max;
		};

		Summary.prototype.min = function () {
		if (this._cache_min === null) {
		this._cache_min = this.sort()[0];
		}

		return this._cache_min;
		};

		@@ -29,3 +29,3 @@
		);


		t.end();
		@@ -39,3 +39,3 @@ });
		);


		t.end();
		@@ -115,1 +115,13 @@ });
		});

		test('testing max method', function (t) {
		t.equal(summary([6, 10, 2, 5]).max(), 10);

		t.end();
		});

		test('testing min method', function (t) {
		t.equal(summary([6, 10, 2, 5]).min(), 2);

		t.end();
		});

Improved metrics