/// <summary>
/// Calculate Stochastic Oscillator, as described here:
/// <see href="https://en.wikipedia.org/wiki/Stochastic_oscillator"/>
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">oscillator period</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>Stochastic Oscillator as time series</returns>
public static _StochasticOscillator StochasticOscillator(this ITimeSeries <double> series, int n = 14,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode(), n);
var container = Cache <_StochasticOscillator> .GetData(
cacheId,
() => new _StochasticOscillator());
double hh = series
.Highest(n, cacheId)[0];
double ll = series
.Lowest(n, cacheId)[0];
double price = series[0];
container.PercentK = IndicatorsBasic.BufferedLambda(
v => 100.0 * (price - ll) / Math.Max(1e-10, hh - ll),
50.0,
cacheId);
container.PercentD = container.PercentK
.SMA(3, cacheId);
return(container);
}
/// <summary>
/// Calculate range over the specified number of past bars.
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">number of bars to search</param>
/// <returns>range between highest and lowest value of past n bars</returns>
public static ITimeSeries <double> Range(this ITimeSeries <double> series, int n)
{
return(series
.Highest(n)
.Subtract(series
.Lowest(n)));
}
/// <summary>
/// Calculate range over the specified number of past bars.
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">number of bars to search</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>range between highest and lowest value of past n bars</returns>
public static ITimeSeries <double> Range(this ITimeSeries <double> series, int n,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode(), n);
return(series
.Highest(n, cacheId)
.Subtract(series
.Lowest(n, cacheId), cacheId));
}
/// <summary>
/// Return current drawdown in percent, as value between 0 and 1.
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">length of observation window</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>drawdown as time series</returns>
public static ITimeSeries <double> Drawdown(this ITimeSeries <double> series, int n,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode(), n);
// TODO: rewrite this, using buffered lambda, see MaxDrawdown
return(IndicatorsBasic.Const(1.0, cacheId)
.Subtract(
series
.Divide(
series
.Highest(n, cacheId),
cacheId),
cacheId));
}
/// <summary>
/// Calculate volatility estimate from recent trading range.
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">length of calculation window</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>volatility as time series</returns>
public static ITimeSeries <double> VolatilityFromRange(this ITimeSeries <double> series, int n,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode(), n);
return(IndicatorsBasic.BufferedLambda(
(v) =>
{
double hi = series.Highest(n)[0];
double lo = series.Lowest(n)[0];
return 0.80 * Math.Sqrt(1.0 / n) * Math.Log(hi / lo);
},
0.0,
cacheId));
}
/// <summary>
/// Calculate Williams %R, as described here:
/// <see href="https://en.wikipedia.org/wiki/Williams_%25R"/>
/// </summary>
/// <param name="series">input time series</param>
/// <param name="n">period</param>
/// <param name="parentId">caller cache id, optional</param>
/// <param name="memberName">caller's member name, optional</param>
/// <param name="lineNumber">caller line number, optional</param>
/// <returns>Williams %R as time series</returns>
public static ITimeSeries <double> WilliamsPercentR(this ITimeSeries <double> series, int n = 10,
CacheId parentId = null, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNumber = 0)
{
var cacheId = new CacheId(parentId, memberName, lineNumber,
series.GetHashCode(), n);
return(IndicatorsBasic.BufferedLambda(
(v) =>
{
double hh = series.Highest(n)[0];
double ll = series.Lowest(n)[0];
double price = series[0];
return -100.0 * (hh - price) / Math.Max(1e-10, hh - ll);
},
-50.0,
cacheId));
}
override public void Run()
{
//---------- initialization
// set simulation time frame
StartTime = DateTime.Parse("01/01/2017", CultureInfo.InvariantCulture);
EndTime = DateTime.Parse("08/01/2018", CultureInfo.InvariantCulture);
// set account value
Deposit(_initialCash);
CommissionPerShare = 0.01;
// add instruments
// the underlying must be added explicitly,
// as the simulation engine requires it
AddDataSource(_underlyingNickname);
AddDataSource(_optionsNickname);
//---------- simulation
// loop through all bars
foreach (DateTime simTime in SimTimes)
{
// find the underlying instrument
// we could also find the underlying from the option chain
_underlyingInstrument = _underlyingInstrument ?? FindInstrument(_underlyingNickname);
// retrieve the underlying spot price
double underlyingPrice = _underlyingInstrument.Close[0];
_initialUnderlyingPrice = _initialUnderlyingPrice ?? underlyingPrice;
// calculate volatility
ITimeSeries <double> volatilitySeries = _underlyingInstrument.Close
.Volatility(10)
.Multiply(Math.Sqrt(252.0));
double volatility = Math.Max(
volatilitySeries.EMA(21)[0],
volatilitySeries.Highest(5)[0]);
// find all expiry dates on the 3rd Friday of the month
List <DateTime> expiryDates = OptionChain(_optionsNickname)
.Where(o => o.OptionExpiry.DayOfWeek == DayOfWeek.Friday && o.OptionExpiry.Day >= 15 && o.OptionExpiry.Day <= 21 ||
o.OptionExpiry.DayOfWeek == DayOfWeek.Saturday && o.OptionExpiry.Day >= 16 && o.OptionExpiry.Day <= 22)
.Select(o => o.OptionExpiry)
.Distinct()
.ToList();
// select expiry 3 to 4 weeks out
DateTime expiryDate = expiryDates
.Where(d => (d - simTime).TotalDays >= 21 &&
(d - simTime).TotalDays <= 28)
.FirstOrDefault();
// retrieve option chain for this expiry
List <Instrument> optionChain = OptionChain(_optionsNickname)
.Where(o => o.OptionIsPut &&
o.OptionExpiry == expiryDate)
.ToList();
// if we are currently flat, attempt to open a position
if (Positions.Count == 0)
{
// determine strike price: far away from spot price
double strikePrice = _underlyingInstrument.Close[0]
/ Math.Exp(1.75 * Math.Sqrt((expiryDate - simTime).TotalDays / 365.25) * volatility);
// find contract closest to our desired strike
Instrument shortPut = optionChain
.OrderBy(o => Math.Abs(o.OptionStrike - strikePrice))
.FirstOrDefault();
// enter short put position
if (shortPut != null)
{
// Interactive Brokers margin requirements for short naked puts:
// Put Price + Maximum((15 % * Underlying Price - Out of the Money Amount),
// (10 % * Strike Price))
double margin = Math.Max(0.15 * underlyingPrice - Math.Max(0.0, underlyingPrice - shortPut.OptionStrike),
0.10 * underlyingPrice);
int contracts = (int)Math.Floor(Math.Max(0.0, _regTMarginToUse * Cash / (100.0 * margin)));
shortPut.Trade(-contracts, OrderType.closeThisBar)
.Comment = "open";
}
}
// monitor and maintain existing positions
else // if (Postions.Count != 0)
{
// find our currently open position
// we might need fancier code, in case we have more than
// one position open
Instrument shortPut = Positions.Keys.First();
// re-evaluate the likely trading range
double expectedLowestPrice = _underlyingInstrument.Close[0]
/ Math.Exp(0.60 * Math.Sqrt((shortPut.OptionExpiry - simTime).Days / 365.25) * volatility);
// exit, when the risk of ending in the money is too high
// and, the contract is actively traded
if (expectedLowestPrice < shortPut.OptionStrike &&
shortPut.BidVolume[0] > 0 &&
shortPut.Ask[0] < 2 * shortPut.Bid[0])
{
shortPut.Trade(-Positions[shortPut], OrderType.closeThisBar)
.Comment = "exit early";
}
}
// plot the underlying against our strategy results, plus volatility
_plotter.SelectChart("nav vs time", "time"); // this will go to Sheet1
_plotter.SetX(simTime);
_plotter.Plot(_underlyingInstrument.Symbol, underlyingPrice / (double)_initialUnderlyingPrice);
_plotter.Plot("volatility", volatilitySeries[0]);
_plotter.Plot("net asset value", NetAssetValue[0] / _initialCash);
}
//---------- post-processing
// create a list of trades on Sheet2
_plotter.SelectChart("trades", "time");
foreach (LogEntry entry in Log)
{
_plotter.SetX(entry.BarOfExecution.Time);
_plotter.Plot("action", entry.Action);
_plotter.Plot("instr", entry.Symbol);
_plotter.Plot("qty", entry.OrderTicket.Quantity);
_plotter.Plot("fill", entry.FillPrice);
_plotter.Plot("comment", entry.OrderTicket.Comment ?? "");
}
FitnessValue = NetAssetValue[0];
}