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# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
# Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from clr import AddReference
AddReference("System")
AddReference("QuantConnect.Algorithm")
AddReference("QuantConnect.Common")
from System import *
from QuantConnect import *
from QuantConnect.Algorithm import *
from QuantConnect.Indicators import *
from datetime import datetime, timedelta
import numpy as np
### <summary>
### Example of custom volatility model
### </summary>
### <meta name="tag" content="using quantconnect" />
### <meta name="tag" content="indicators" />
### <meta name="tag" content="reality modelling" />
class CustomVolatilityModelAlgorithm(QCAlgorithm):
def Initialize(self):
self.SetStartDate(2013,10,7) #Set Start Date
self.SetEndDate(2015,7,15) #Set End Date
self.SetCash(100000) #Set Strategy Cash
# Find more symbols here: http://quantconnect.com/data
self.equity = self.AddEquity("SPY", Resolution.Daily)
self.equity.SetVolatilityModel(CustomVolatilityModel(10))
def OnData(self, data):
if not self.Portfolio.Invested and self.equity.VolatilityModel.Volatility > 0:
self.SetHoldings("SPY", 1)
# Python implementation of StandardDeviationOfReturnsVolatilityModel
# Computes the annualized sample standard deviation of daily returns as the volatility of the security
# https://github.com/QuantConnect/Lean/blob/master/Common/Securities/Volatility/StandardDeviationOfReturnsVolatilityModel.cs
class CustomVolatilityModel():
def __init__(self, periods):
self.lastUpdate = datetime.min
self.lastPrice = 0
self.needsUpdate = False
self.periodSpan = timedelta(1)
self.window = RollingWindow[float](periods)
# Volatility is a mandatory attribute
self.Volatility = 0
# Updates this model using the new price information in the specified security instance
# Update is a mandatory method
def Update(self, security, data):
timeSinceLastUpdate = data.EndTime - self.lastUpdate
if timeSinceLastUpdate >= self.periodSpan and data.Price > 0:
if self.lastPrice > 0:
self.window.Add(float(data.Price / self.lastPrice) - 1.0)
self.needsUpdate = self.window.IsReady
self.lastUpdate = data.EndTime
self.lastPrice = data.Price
if self.window.Count < 2:
self.Volatility = 0
return
if self.needsUpdate:
self.needsUpdate = False
std = np.std([ x for x in self.window ])
self.Volatility = std * np.sqrt(252.0)
# Returns history requirements for the volatility model expressed in the form of history request
# GetHistoryRequirements is a mandatory method
def GetHistoryRequirements(self, security, utcTime):
# For simplicity's sake, we will not set a history requirement
return None