jstat - npm Package Compare versions

Comparing version 1.8.0 to 1.8.1

doc/md/vector.md

@@ -806,7 +806,9 @@ ## Vector Functionality
 
-**percentile( dataArray, k )**
+**percentile( dataArray, k, [exclusive] )**
 
 Returns the k-th percentile of values in the `dataArray` range, where k is in the range 0..1, exclusive.
+Passing true for the exclusive parameter excludes both endpoints of the range.
 
      jStat.percentile([1, 2, 3, 4], 0.3) === 1.9;
+     jStat.percentile([1, 2, 3, 4], 0.3, true) === 1.5;
 
@@ -813,0 +815,0 @@ ### percentileOfScore()

package.json

 {
   "name": "jstat",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "description": "Statistical Library for JavaScript",
@@ -5,0 +5,0 @@ "homepage": "http://github.com/jstat/jstat",

README.md

@@ -29,3 +29,3 @@ [jStat](http://www.jstat.org/) - JavaScript Statistical Library
 
-CDN
+CDN [![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/jstat/badge?style=rounded)](https://www.jsdelivr.com/package/npm/jstat)
 ---
@@ -32,0 +32,0 @@

src/core.js

@@ -404,2 +404,3 @@ var jStat = (function(Math, undefined) {
   var rl = [];
+  var i;
   step = step || 1;
@@ -406,0 +407,0 @@ if (end === undefined) {

src/test.js

@@ -132,6 +132,2 @@ (function(jStat, Math) {
     }
-    // 2 sample case
-    if (args.length === 2) {
-      return jStat.variance(args[0]) / jStat.variance(args[1]);
-    }
     // Builds sample array
@@ -138,0 +134,0 @@ sample = new Array();

src/vector.js

@@ -311,18 +311,16 @@ (function(jStat, Math) {
 
-// Returns the k-th percentile of values in a range, where k is in the
-// range 0..1, exclusive.
-jStat.percentile = function percentile(arr, k) {
+// Return the k-th percentile of values in a range, where k is in the range 0..1, inclusive.
+// Passing true for the exclusive parameter excludes both endpoints of the range.
+jStat.percentile = function percentile(arr, k, exclusive) {
   var _arr = arr.slice().sort(ascNum);
-  var realIndex = k * (_arr.length - 1);
+  var realIndex = k * (_arr.length + (exclusive ? 1 : -1)) + (exclusive ? 0 : 1);
   var index = parseInt(realIndex);
   var frac = realIndex - index;
-
   if (index + 1 < _arr.length) {
-    return _arr[index] * (1 - frac) + _arr[index + 1] * frac;
+    return _arr[index - 1] + frac * (_arr[index] - _arr[index - 1]);
   } else {
-    return _arr[index];
+    return _arr[index - 1];
   }
 }
 
-
 // The percentile rank of score in a given array. Returns the percentage
@@ -329,0 +327,0 @@ // of all values in the input array that are less than (kind='strict') or

test/vector/percentile-test.js

@@ -16,4 +16,25 @@ var vows = require('vows');
     },
+    '30th percentile of the list in the range with exclusive flag true': function(jStat) {
+      assert.deepEqual(jStat.percentile([1, 2, 3, 4], 0.3, true), 1.5);
+    },
     '30th percentile of the list in the range, unsorted': function(jStat) {
       assert.deepEqual(jStat.percentile([3, 1, 4, 2], 0.3), 1.9);
+    },
+    '40th percentile of the list in the range with exclusive flag false': function(jStat) {
+      assert.epsilon(0.0000001, jStat.percentile([15, 20, 35, 40, 50], 0.4, false), 29);
+    },
+    '40th percentile of the list in the range with exclusive flag true': function(jStat) {
+      assert.epsilon(0.0000001, jStat.percentile([15, 20, 35, 40, 50], 0.4, true), 26);
+    },
+    '10th percentile of the list in the range with exclusive flag false': function(jStat) {
+      assert.epsilon(0.0000001, jStat.percentile([15, 20, 35, 40, 50], 0.1, false), 17);
+    },
+    '10th percentile of the list in the range with exclusive flag true': function(jStat) {
+      assert(isNaN(jStat.percentile([15, 20, 35, 40, 50], 0.1, true)));
+    },
+    '100th percentile of the list in the range with exclusive flag false': function(jStat) {
+      assert.epsilon(0.0000001, jStat.percentile([15, 20, 35, 40, 50], 1, false), 50);
+    },
+    '100th percentile of the list in the range with exclusive flag true': function(jStat) {
+      assert(isNaN(jStat.percentile([15, 20, 35, 40, 50], 1, true)));
     }
@@ -20,0 +41,0 @@ }

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Improved metrics

Total package byte prevSize

697292

increased by0.33%

Number of package files

152

increased by0.66%

Lines of code

15220

increased by0.23%

No dependency changes