def test_merge(self):
a = stats.MeanVarStat()
b = stats.MeanVarStat()
a.add_outcome(1)
b.add_outcome(1)
b.merge(a)
self.assertEquals(b.frequency(), 2)
def test_simple(self):
d = stats.MeanVarStat()
d.add_outcome(2.) # freq = 1, sum = 2, sum_sq = 4
d.add_outcome(3.) # freq = 2, sum = 5, sum_sq = 13
self.assertEquals(d.frequency(), 2)
self.assertEquals(d.mean(), 2.5)
self.assertEquals(d.variance(), (13 - 25. / 2) / 1)
def test_simple(self):
d = stats.MeanVarStat()
# prior says 1 2p win, 1 2p loss # freq = 2, sum = 2, sum_sq = 4
d.add_outcome(2) # freq = 3, sum = 4, sum_sq = 8
d.add_outcome(3) # freq = 4, sum = 7, sum_sq = 17
self.assertEquals(d.real_frequency(), 2)
self.assertEquals(d.frequency(), 4)
self.assertEquals(d.mean(), 7. / 4)
self.assertEquals(d.variance(), (17 - 49. / 4) / 3)
def testSimple(self):
d = stats.MeanVarStat()
d.AddOutcome(4) # 10 - 4 = 6, 6^2 = 36
d.AddOutcome(16) # 16 - 10 = 6, 6^2 = 36
d.AddOutcome(13) # 13 - 10 = 3, 3^2 = 9
d.AddOutcome(7) # 10 - 7 = 3, 3^2 = 9
# 36 + 36 + 9 + 9 = 90, 90 / 3 = 30
self.assertEquals(d.Frequency(), 4)
self.assertEquals(d.Mean(), 10)
self.assertEquals(d.Variance(), 30.0)
def test_no_occurrences(self):
d = stats.MeanVarStat()
self.assertEquals(d.mean(), float('inf'))
self.assertEquals(d.variance(), float('inf'))
self.assertEquals(d.std_dev(), float('inf'))
self.assertEquals(d.sample_std_dev(), float('inf'))