def testVariance(self):
data = [1, 2, 3]
assert stats.mean(data) == 2
self.assertEqual(stats.pvariance(data), 2/3)
self.assertEqual(stats.variance(data), 1.0)
self.assertEqual(stats.pstdev(data), math.sqrt(2/3))
self.assertEqual(stats.stdev(data), 1.0)
def testPStdev(self):
result = stats.pstdev(self.data)
expected = self.expected["pstdev"]
self.assertAlmostEqual(result, expected, places=self.places)
