/** * @test */ public function getStandarDeviation() { $values = $this->getValuesFromData($this->listFilteredByOneSubgroup(true)); $this->assertEquals(100, $this->statistic->sampleStandardDeviation($values)); $values->rewind(); $this->assertEquals(81.65000000000001, $this->statistic->populationStandardDeviation($values)); }
function testStandardDeviation(Statistic $statistic){ $values = new ArrayObject(array(3,5,2,1,3,4,6,9,3)); assertEquals($statistic->populationStandardDeviation($values->getIterator()), 2.26); assertEquals($statistic->sampleStandardDeviation($values->getIterator()), 2.398); }