def test_is_last_point_in_control_does_not_generate_false_positives_when_outliers_exist_but_are_not_last(
self):
chart = ControlChart(SERIES_WITH_UCL_OUTLIERS)
chart_points_outside_ucl = chart.points_outside_ucl()
self.assertGreater(len(chart_points_outside_ucl), 0)
self.assertTrue(chart.is_last_point_in_control())
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_get_last_point(self):
chart = ControlChart(SERIES_UNDER_CONTROL)
last_index = len(SERIES_UNDER_CONTROL) - 1
expected_last_point = (last_index, SERIES_UNDER_CONTROL[last_index])
last_point = chart.get_last_point()
print "expected_last_point: {}".format(expected_last_point)
print "last_point: {}".format(last_point)
self.assertEquals(expected_last_point, last_point)
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_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_get_last_point(self):
chart = ControlChart(SERIES_UNDER_CONTROL)
last_index = len(SERIES_UNDER_CONTROL) - 1
expected_last_point = (last_index, SERIES_UNDER_CONTROL[last_index])
last_point = chart.get_last_point()
print "expected_last_point: {}".format(expected_last_point)
print "last_point: {}".format(last_point)
self.assertEquals(expected_last_point, last_point)
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())
def test_data_series_is_analyzed(self):
tf = tempfile.NamedTemporaryFile()
control_chart = ControlChart(SERIES_UNDER_CONTROL)
test_input = ""
for val in SERIES_UNDER_CONTROL:
test_input += " {} \n".format(str(val))
tf.write(test_input)
tf.flush()
sys.argv = ["analyze_series", tf.name, "--verbose"]
(status, message) = self._analyze_series_cmd.execute()
self.assertEquals(AnalyzeSeriesCommand.STATUS_SUCCESS, status)
self.assertEquals("", message)
expected_mean = control_chart.mean()
actual_mean = self._analyze_series_cmd._control_chart.mean()
self.assertAlmostEquals(expected_mean, actual_mean, places=3)
def test_data_series_is_analyzed(self):
tf = tempfile.NamedTemporaryFile()
control_chart = ControlChart(SERIES_UNDER_CONTROL)
test_input = ""
for val in SERIES_UNDER_CONTROL:
test_input += " {} \n".format(str(val))
tf.write(test_input)
tf.flush()
sys.argv = ["analyze_series", tf.name, "--verbose"]
(status, message) = self._analyze_series_cmd.execute()
self.assertEquals(AnalyzeSeriesCommand.STATUS_SUCCESS, status)
self.assertEquals("", message)
expected_mean = control_chart.mean()
actual_mean = self._analyze_series_cmd._control_chart.mean()
self.assertAlmostEquals(expected_mean, actual_mean, places=3)
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_can_get_last_point_when_only_one_point_exists(self):
series = (42, )
chart = ControlChart(series)
self.assertEquals((0, 42), chart.get_last_point())
def test_chart_handles_get_last_point_on_empty_series_gracefully(self):
series = ()
chart = ControlChart(series)
self.assertIsNone(chart.get_last_point())
def test_points_outside_ucl_are_identified(self):
chart = ControlChart(SERIES_WITH_UCL_OUTLIERS)
index = 18
value = 4
self.assertIn((index, value), chart.points_outside_ucl())
def test_points_outside_ucl_are_identified(self):
chart = ControlChart(SERIES_WITH_UCL_OUTLIERS)
index = 18
value = 4
self.assertIn((index, value), chart.points_outside_ucl())
def test_is_last_point_in_control_does_not_generate_false_positives_when_outliers_exist_but_are_not_last(self):
chart = ControlChart(SERIES_WITH_UCL_OUTLIERS)
chart_points_outside_ucl = chart.points_outside_ucl()
self.assertGreater(len(chart_points_outside_ucl), 0)
self.assertTrue(chart.is_last_point_in_control())
def test_chart_can_get_last_point_when_only_one_point_exists(self):
series = (42,)
chart = ControlChart(series)
self.assertEquals((0, 42), chart.get_last_point())
def test_chart_handles_get_last_point_on_empty_series_gracefully(self):
series = ()
chart = ControlChart(series)
self.assertIsNone(chart.get_last_point())