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PHP Statistics::variance方法代码示例

本文整理汇总了PHP中Statistics::variance方法的典型用法代码示例。如果您正苦于以下问题:PHP Statistics::variance方法的具体用法?PHP Statistics::variance怎么用?PHP Statistics::variance使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在Statistics的用法示例。


在下文中一共展示了Statistics::variance方法的3个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的PHP代码示例。

示例1: __construct

 public function __construct(array $samples, array $stats = [])
 {
     if (count($samples) < 1) {
         throw new \LogicException('Cannot create a distribution with zero samples.');
     }
     $this->samples = $samples;
     $this->closures = ['min' => function () {
         return min($this->samples);
     }, 'max' => function () {
         return max($this->samples);
     }, 'sum' => function () {
         return array_sum($this->samples);
     }, 'stdev' => function () {
         return Statistics::stdev($this->samples);
     }, 'mean' => function () {
         return Statistics::mean($this->samples);
     }, 'mode' => function () {
         return Statistics::kdeMode($this->samples);
     }, 'variance' => function () {
         return Statistics::variance($this->samples);
     }, 'rstdev' => function () {
         $mean = $this->getMean();
         return $mean ? $this->getStdev() / $mean * 100 : 0;
     }];
     if ($diff = array_diff(array_keys($stats), array_keys($this->closures))) {
         throw new \RuntimeException(sprintf('Unknown pre-computed stat(s) encountered: "%s"', implode('", "', $diff)));
     }
     $this->stats = $stats;
 }
开发者ID:dantleech,项目名称:phpbench,代码行数:29,代码来源:Distribution.php

示例2: testStandardError

 public function testStandardError()
 {
     $stats = new Statistics();
     $sets = $this->getSetData();
     foreach ($sets as $name => $data) {
         $stats->set($name, $data['set']);
         $this->assertEquals($data['variance'], $stats->variance($name), 'Set ' . $name . ' variance()');
     }
 }
开发者ID:giberti,项目名称:phormance,代码行数:9,代码来源:StatisticsTest.php

示例3: testVariance

 public function testVariance()
 {
     //
     // Sample (default)
     //
     //
     // Integers
     //
     $values = [2, 4, 4, 4, 5, 5, 7, 9];
     $sample = true;
     $result = Statistics::variance($values, $sample);
     $expected = 4.571429;
     $this->assertEquals($expected, $result, '', pow(10, -4));
     //
     // Floats
     //
     $values = [0.0, 0.25, 0.25, 1.25, 1.5, 1.75, 2.75, 3.25];
     $sample = true;
     $result = Statistics::variance($values, $sample);
     $expected = 1.428571;
     $this->assertEquals($expected, $result, '', pow(10, -4));
     //
     // Population
     //
     //
     // Integers
     //
     $values = [2, 4, 4, 4, 5, 5, 7, 9];
     $sample = false;
     $result = Statistics::variance($values, $sample);
     $expected = 4;
     $this->assertIdentical($expected, $result);
     //
     // Floats
     //
     $values = [0.0, 0.25, 0.25, 1.25, 1.5, 1.75, 2.75, 3.25];
     $sample = false;
     $result = Statistics::variance($values, $sample);
     $expected = 1.25;
     $this->assertIdentical($expected, $result, '', pow(10, -4));
 }
开发者ID:tersmitten,项目名称:cakephp-statistics,代码行数:41,代码来源:StatisticsTest.php


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