class MovingAlphaBeta(StatefulValueHolder): def __init__(self, window, dependency=('pRet', 'mRet', 'riskFree')): self._returnSize = 2 super(MovingAlphaBeta, self).__init__(window, dependency) self._pReturnMean = MovingAverage(window, dependency='x') self._mReturnMean = MovingAverage(window, dependency='y') self._pReturnVar = MovingVariance(window, dependency='x') self._mReturnVar = MovingVariance(window, dependency='y') self._correlationHolder = MovingCorrelation(window, dependency=['x', 'y']) def push(self, data): value = super(MovingAlphaBeta, self).push(data) if value is None: return pReturn = value[0] mReturn = value[1] rf = value[2] data = {'x': pReturn - rf, 'y': mReturn - rf} self._pReturnMean.push(data) self._mReturnMean.push(data) self._pReturnVar.push(data) self._mReturnVar.push(data) self._correlationHolder.push(data) def result(self): corr = self._correlationHolder.result() pStd = math.sqrt(self._pReturnVar.result()) mStd = math.sqrt(self._mReturnVar.result()) beta = corr * pStd / mStd alpha = self._pReturnMean.result() - beta * self._mReturnMean.result() return alpha, beta
class MovingSharp(StatefulValueHolder): def __init__(self, window, dependency=('ret', 'riskFree')): super(MovingSharp, self).__init__(window, dependency) self._mean = MovingAverage(window, dependency='x') self._var = MovingVariance(window, dependency='x', isPopulation=False) def push(self, data): value = super(MovingSharp, self).push(data) ret = value[0] benchmark = value[1] data = {'x': ret - benchmark} self._mean.push(data) self._var.push(data) def result(self): return self._mean.result() / math.sqrt(self._var.result())
def testMultiplyOperator(self): mv5 = MovingVariance(5, 'close') average = Average('open') mulRes = MovingVariance(5, 'close') * Average('open') for i, (open, close) in enumerate(zip(self.sampleOpen, self.sampleClose)): data = {'close': close, 'open': open} mv5.push(data) average.push(data) mulRes.push(data) if i >= 1: expected = mv5.result() * average.result() calculated = mulRes.result() self.assertAlmostEqual(calculated, expected, 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected, calculated))
class MovingAlphaBeta(StatefulValueHolder): def __init__(self, window, dependency=('pRet', 'mRet', 'riskFree')): super(MovingAlphaBeta, self).__init__(window, dependency) self._returnSize = 2 self._pReturnMean = MovingAverage(window, dependency='x') self._mReturnMean = MovingAverage(window, dependency='y') self._pReturnVar = MovingVariance(window, dependency='x') self._mReturnVar = MovingVariance(window, dependency='y') self._correlationHolder = MovingCorrelation(window, dependency=['x', 'y']) def push(self, data): value = super(MovingAlphaBeta, self).push(data) if np.any(np.isnan(value)): return np.nan pReturn = value[0] mReturn = value[1] rf = value[2] data = {'x': pReturn - rf, 'y': mReturn - rf} self._pReturnMean.push(data) self._mReturnMean.push(data) self._pReturnVar.push(data) self._mReturnVar.push(data) self._correlationHolder.push(data) def result(self): corr = self._correlationHolder.result() tmp = self._pReturnVar.result() if not isClose(tmp, 0.): pStd = math.sqrt(tmp) else: pStd = 0. tmp = self._mReturnVar.result() if not isClose(tmp, 0.): mStd = math.sqrt(tmp) else: mStd = 0. if not isClose(tmp, 0.): beta = corr * pStd / mStd else: beta = 0. alpha = self._pReturnMean.result() - beta * self._mReturnMean.result() return alpha, beta
def testMultiplyOperator(self): mv5 = MovingVariance(5, 'close') average = Average('open') mulRes = MovingVariance(5, 'close') * Average('open') concated = (Average('open') ^ mv5) * Average('open') concated2 = Average('open') * (Average('open') ^ mv5) for i, (open, close) in enumerate(zip(self.sampleOpen, self.sampleClose)): data = {'close': close, 'open': open} mv5.push(data) average.push(data) mulRes.push(data) concated.push(data) concated2.push(data) if i >= 1: expected = mv5.result() * average.result() calculated = mulRes.result() self.assertAlmostEqual(calculated, expected, 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected, calculated)) expected = (average.result() * average.result(), mv5.result() * average.result()) calculated = concated.result() self.assertAlmostEqual(calculated[0], expected[0], 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected[0], calculated[0])) self.assertAlmostEqual(calculated[1], expected[1], 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected[1], calculated[1])) calculated = concated2.result() self.assertAlmostEqual(calculated[0], expected[0], 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected[0], calculated[0])) self.assertAlmostEqual(calculated[1], expected[1], 12, "at index {0:d}\n" "expected: {1:f}\n" "calculated: {2:f}".format(i, expected[1], calculated[1]))