def test_chart_computes_control_limits(self): chart = ControlChart(SERIES_WITH_UCL_OUTLIERS) (lcl, ucl) = chart.control_limits() self.assertEquals(lcl, chart.lower_control_limit()) self.assertEquals(ucl, chart.upper_control_limit()) self.assertAlmostEqual(lcl, -3.1952, places=4) self.assertAlmostEqual(ucl, 3.4809, places=4)
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())