def test_chart_computes_sample_statistics(self):
series = (1, 2, 2, 3, 3, 3, 2, 2, 1)
chart = ControlChart(series)
self.assertAlmostEqual(2.1111, chart.mean(), places=4)
self.assertEquals(2, chart.median())
self.assertAlmostEqual(0.78173, chart.std_dev(), places=3)
self.assertEquals(len(series), chart.count())
def test_chart_computes_sample_statistics(self):
series = (1, 2, 2, 3, 3, 3, 2, 2, 1)
chart = ControlChart(series)
self.assertAlmostEqual(2.1111, chart.mean(), places=4)
self.assertEquals(2, chart.median())
self.assertAlmostEqual(0.78173, chart.std_dev(), places=3)
self.assertEquals(len(series), chart.count())
def test_series_under_control(self):
chart = ControlChart(SERIES_UNDER_CONTROL)
self.assertEquals(10.05, chart.mean())
self.assertEquals(10.05, chart.median())
self.assertAlmostEquals(0.8737, chart.std_dev(), places=4)
self.assertAlmostEquals(7.429, chart.lower_control_limit(), places=3)
self.assertAlmostEquals(12.671, chart.upper_control_limit(), places=3)
self.assertEquals([], chart.points_outside_lcl())
self.assertEquals([], chart.points_outside_ucl())
def test_series_under_control(self):
chart = ControlChart(SERIES_UNDER_CONTROL)
self.assertEquals(10.05, chart.mean())
self.assertEquals(10.05, chart.median())
self.assertAlmostEquals(0.8737, chart.std_dev(), places=4)
self.assertAlmostEquals(7.429, chart.lower_control_limit(), places=3)
self.assertAlmostEquals(12.671, chart.upper_control_limit(), places=3)
self.assertEquals([], chart.points_outside_lcl())
self.assertEquals([], chart.points_outside_ucl())