public static double CaculateRebalanceCost(List <string> ETFs,
List <string> ETFs_holding,
double[] ETFs_holding_allocation,
DataPreProcessing preprocessing)
{
var Expected_Allocation = PO.ETF2AllocationOwnOptim(ETFs, preprocessing);
double rebalance = 0;
var Union_ETFs = ETFs.Union(ETFs_holding).ToArray();
double[] Lastweek = new double[Union_ETFs.Count()];
double[] Thisweek = new double[Union_ETFs.Count()];
for (int j = 0; j < Union_ETFs.Count(); j++)
{
Lastweek[j] = 0;
for (int i = 0; i < ETFs_holding.Count(); i++)
{
if (ETFs_holding[i] == Union_ETFs[j])
{
Lastweek[j] = ETFs_holding_allocation[i];
}
else
{
continue;
}
}
}
for (int j = 0; j < Union_ETFs.Count(); j++)
{
Thisweek[j] = 0;
for (int i = 0; i < ETFs.Count(); i++)
{
if (ETFs[i] == Union_ETFs[j])
{
Thisweek[j] = Expected_Allocation[i];
}
else
{
continue;
}
}
}
for (int i = 0; i < Union_ETFs.Count(); i++)
{
rebalance += Math.Abs(Thisweek[i] - Lastweek[i]);
}
double rebalance_cost = rebalance * 0.05;
Console.WriteLine("Rebalance Cost is {0}", rebalance_cost);
return(rebalance_cost);
}
public static void BackTest(string Date, string Weeks)
{
///////////////////////////
///
/// Setting backtest object
///
//////////////////////////
Backtest Mybacktest = new Backtest();
Backtest Mybacktest_adj = new Backtest();
// Initial the two backtest
Mybacktest.Init();
Mybacktest_adj.Init();
///////////////////////////
///
/// Setting data container to store the information
/// outside the for loop
///
///////////////////////////
// setting netvalue lists for both standard strategy and dynamic strategy
List <double> Hisc_netValue = new List <double>();
List <double> Adj_netValue = new List <double>();
// setting lists to store Fixed Income ETFs and Equity ETFs
// we are holding during this trading week for the caculation of
// Turnover Utility function
List <string> ETFs_holding_FI = new List <string>();
List <string> ETFs_holding_Equ = new List <string>();
// setting matrix to store the trading history during this backtest
string[][] trading_history_ETF = new string[Convert.ToInt64(Weeks)][];
double[][] trading_history_allocation = new double[Convert.ToInt64(Weeks)][];
double[][] ADJtrading_history_allocation = new double[Convert.ToInt64(Weeks)][];
// setting two variable drawdown and position ratio for the caculation
// in Dynamic strategy, position ratio means the percentage of Fixed Income
// ETFs we are currently holding
double DrawDown = 0;
double Position_ratio = 0.2;
int FI_holding_weeks = 0;
int Equ_holding_weeks = 0;
double[] FI_holding_allocation = new double[5];
double[] Equ_holding_allocation = new double[5];
//////////////////////////////////
///
/// For loop backtest
///
/////////////////////////////////
for (int i = 0; i < Convert.ToInt64(Weeks); i++)
{
// seting Datapreprocessing class for both Fixed Income ETFs and Equity ETFs
DataPreProcessing pro_FI = new DataPreProcessing();
DataPreProcessing pro_Equ = new DataPreProcessing();
// caculate the date of today start from the 'Date'
// which is given by backtest function
var Today = DateTime.Parse(Date).AddDays(i * 7);
// print the date we trained the model and trade
Console.WriteLine("Date: {0}", Today.ToString());
// cleaning data use data preprocessing class
pro_FI.Run(Today.ToString(), 112, "Fixed Income");
pro_Equ.Run(Today.ToString(), 112, "Equity");
// Set prediction vector
double[] predictions_FI = new double[pro_FI.Trade_ETF.Count];
double[] predictions_Equ = new double[pro_Equ.Trade_ETF.Count];
// Set blend ETFs list to store the Top 10 etfs which is going to be
// longed by the algorithm
List <string> Blend_ETFs = new List <string>();
/////////////////////////////
/// ///////
/// FI ETF prediction ///////
/// ///////
/////////////////////////////
for (int j = 0; j < pro_FI.Trade_ETF.Count; j++)
{
// Grab the data from the datapreprocessing object class
var y = pro_FI.Target_List[j];
var fy = new FrameBuilder.Columns <DateTime, string> {
{ "Y", y }
}.Frame;
var data = pro_FI.Feature_List[j].Join(fy);
var pred_Features = pro_FI.pred_Feature_List[j];
data.SaveCsv("dataset.csv");
// Training machine learning and predict
var prediction = Learning.FitGBT(pred_Features);
predictions_FI[j] = prediction;
}
// Get the minimum scores of top 5 ETF
var hold_FI = PredRanking(predictions_FI, 5);
// Get the namelist of top 5 ETF
List <string> ETFs_FI = new List <string>();
for (int m = 0; m < pro_FI.Trade_ETF.Count; m++)
{
if (predictions_FI[m] >= hold_FI)
{
ETFs_FI.Add(pro_FI.Trade_ETF[m]);
}
}
// Caculate the bid-ask spread cost if trade all 5 ETFs given by algorithm
double[] FixedIncomeSpread = new double[5];
FixedIncomeSpread = GetBidAskSpread(ETFs_FI.ToArray());
// Cacualte the Unitility and decide if we should trade this week
if (i == 0)
{
ETFs_holding_FI = ETFs_FI;
}
else
{
// get all prediction results of both holding etf and etfs which we may be going to trade
double[] holding_pred = ETFname2Prediction(ETFs_holding_FI, predictions_FI, pro_FI);
double[] long_pred = ETFname2Prediction(ETFs_FI, predictions_FI, pro_FI);
// caculate the trade diff which is the utility of trading this week
double trade_diff = long_pred.Sum() -
holding_pred.Sum() -
CaculateRebalanceCost(ETFs_FI,
ETFs_holding_FI,
FI_holding_allocation,
pro_FI);
// check if it is worth of trading
if (trade_diff < 0)
{
// It is not worth of trading and ETFs portfolio will be same
FI_holding_weeks += 1;
ETFs_FI = ETFs_holding_FI;
// setting spread equals to 0 because we are not going to trade this week
FixedIncomeSpread = new double[] { 0, 0, 0, 0, 0 };
}
else
{
FI_holding_weeks = 0;
// It is worth of changing positions and trading this week !
// recaculate the spread costs because we may not going to trade all
// ETFs which we are holding right now.
for (int m = 0; m < 5; m++)
{
for (int n = 0; n < 5; n++)
{
if (ETFs_FI[m] == ETFs_holding_FI[n])
{
FixedIncomeSpread[m] = 0;
}
else
{
continue;
}
}
}
// resetting the fixed income ETFs we are holding
ETFs_holding_FI = ETFs_FI;
}
}
Console.WriteLine("Long the following ETFs: ");
// Store the Fixed Income ETFs namelist to blend ETFs list
for (int n = 0; n < ETFs_FI.Count; n++)
{
Console.WriteLine(ETFs_FI[n]);
Blend_ETFs.Add(ETFs_FI[n]);
}
///////////////////////////////////
/// ///////
/// Equity ETF prediction ///////
/// ///////
///////////////////////////////////
for (int j = 0; j < pro_Equ.Trade_ETF.Count; j++)
{
// Run machine learning and predict next week for all ETFss
var y = pro_Equ.Target_List[j];
var fy = new FrameBuilder.Columns <DateTime, string> {
{ "Y", y }
}.Frame;
var data = pro_Equ.Feature_List[j].Join(fy);
var pred_Features = pro_Equ.pred_Feature_List[j];
data.SaveCsv("dataset.csv");
var prediction = Learning.FitGBT(pred_Features);
predictions_Equ[j] = prediction;
}
List <string> ETFs_Equ = new List <string>();
// Find the min score of top 5 best ETFs
var hold_Equ = PredRanking(predictions_Equ, 5);
for (int m = 0; m < pro_Equ.Trade_ETF.Count; m++)
{
if (predictions_Equ[m] >= hold_Equ)
{
ETFs_Equ.Add(pro_Equ.Trade_ETF[m]);
}
}
// caculate the bidAsk Spread
double[] EquityBASpread = new double[5];
EquityBASpread = GetBidAskSpread(ETFs_Equ.ToArray());
if (i == 0)
{
ETFs_holding_Equ = ETFs_Equ;
}
else
{
double[] holding_pred = ETFname2Prediction(ETFs_holding_Equ, predictions_Equ, pro_Equ);
double[] long_pred = ETFname2Prediction(ETFs_Equ, predictions_Equ, pro_Equ);
// Caculate the Utility
double trade_diff = long_pred.Sum() -
holding_pred.Sum() -
CaculateRebalanceCost(ETFs_Equ,
ETFs_holding_Equ,
Equ_holding_allocation,
pro_Equ);
// check if it is worth of trading this week
if (trade_diff < 0)
{
Equ_holding_weeks += 1;
ETFs_Equ = ETFs_holding_Equ;
EquityBASpread = new double[] { 0, 0, 0, 0, 0 };
}
else
{
// Recacluate the spread costs
Equ_holding_weeks = 0;
for (int m = 0; m < 5; m++)
{
for (int n = 0; n < 5; n++)
{
if (ETFs_Equ[m] == ETFs_holding_Equ[n])
{
EquityBASpread[m] = 0;
}
else
{
continue;
}
}
}
ETFs_holding_Equ = ETFs_Equ;
}
}
// Store the Equity ETFs we are going to long in Blend ETFs list
for (int n = 0; n < ETFs_Equ.Count; n++)
{
Console.WriteLine(ETFs_Equ[n]);
Blend_ETFs.Add(ETFs_Equ[n]);
}
// Caculate optimized allocations for both Fixed income and Equity ETFs
//////////////////////////////
Console.WriteLine("Holding weeks for current Fixed Income ETFs is {0}", FI_holding_weeks);
Console.WriteLine("Holding weeks for current Equity ETFs is {0}", Equ_holding_weeks);
double[] AllocationFI = new double[5];
if (FI_holding_weeks == 0)
{
AllocationFI = PO.ETF2AllocationOwnOptim(ETFs_FI, pro_FI);
FI_holding_allocation = AllocationFI;
}
else if (FI_holding_weeks < 15)
{
AllocationFI = FI_holding_allocation;
}
else
{
FI_holding_weeks = 0;
AllocationFI = PO.ETF2AllocationOwnOptim(ETFs_FI, pro_FI);
FI_holding_allocation = AllocationFI;
}
//////////////////////////////
double[] AllocationEqu = new double[5];
if (Equ_holding_weeks == 0)
{
AllocationEqu = PO.ETF2AllocationOwnOptim(ETFs_Equ, pro_Equ);
Equ_holding_allocation = AllocationEqu;
}
else if (Equ_holding_weeks < 15)
{
AllocationEqu = Equ_holding_allocation;
}
else
{
Equ_holding_weeks = 0;
AllocationEqu = PO.ETF2AllocationOwnOptim(ETFs_Equ, pro_Equ);
Equ_holding_allocation = AllocationEqu;
}
//////////////////////////////
// Setting allocations which is an array to store allocations for strandard strategy
double[] allocations = new double[10];
for (int fi = 0; fi < 5; fi++)
{
allocations[fi] = AllocationFI[fi] * 0.2;
}
for (int equ = 0; equ < 5; equ++)
{
allocations[equ + 5] = AllocationEqu[equ] * 0.8;
}
// Setting ALLOCATION which is an array to store allocations for strandard strategy
double[] ALLOCATION = new double[10];
for (int fi = 0; fi < 5; fi++)
{
ALLOCATION[fi] = AllocationFI[fi] * Position_ratio;
}
for (int equ = 0; equ < 5; equ++)
{
ALLOCATION[equ + 5] = AllocationEqu[equ] * (1 - Position_ratio);
}
// Transform ETFs list to an array
string[] ETFs = new string[10];
for (int etf = 0; etf < 10; etf++)
{
ETFs[etf] = Blend_ETFs[etf];
}
// Storing the ETFs trading history and allocations
trading_history_ETF[i] = new string[10];
trading_history_ETF[i] = ETFs;
trading_history_allocation[i] = new double[10];
trading_history_allocation[i] = allocations;
ADJtrading_history_allocation[i] = new double[10];
ADJtrading_history_allocation[i] = ALLOCATION;
// Get the spread array for all ETFs
double[] spread = new double[10];
Array.Copy(FixedIncomeSpread, spread, FixedIncomeSpread.Length);
Array.Copy(EquityBASpread, 0, spread, FixedIncomeSpread.Length, EquityBASpread.Length);
// Caculate the weighted spread for the adjustment in netvalue
double weighted_spread = 0;
for (int spreadItem = 0; spreadItem < 10; spreadItem++)
{
weighted_spread += allocations[spreadItem] * spread[spreadItem];
}
// clearing the NetValue
Hisc_netValue.Add(Mybacktest.Rebalance(Today, ETFs, allocations) * (1 - weighted_spread));
Adj_netValue.Add(Mybacktest_adj.Rebalance(Today, ETFs, ALLOCATION) * (1 - weighted_spread));
// Caculate the current drawdown and adjust the position ratio which is
// the percentage for the fixed income ETFs
if (i == 0)
{
DrawDown = 0;
}
else
{
DrawDown = 1 - Hisc_netValue.Last() / Hisc_netValue.Max();
}
// Adjust the position ratio
if (DrawDown > 0.1)
{
Position_ratio = 0.8;
}
else if (DrawDown > 0.08)
{
Position_ratio = 0.6;
}
else if (DrawDown > 0.05)
{
Position_ratio = 0.4;
}
else
{
Position_ratio = 0.2;
}
// Print out the current drawdown and position ratio.
Console.WriteLine("Current drawdown is: {0}", DrawDown);
Console.WriteLine("Fixed Income has been adjusted to: {0} %", Position_ratio * 100);
}
// Result analysis for NetValue
/////////////////////
///
/// Backtest Metrics of Strandard Strategy
///
////////////////////
var StrategyNetValue = Hisc_netValue.ToArray();
double MaxDD = 0;
for (int i = 1; i < StrategyNetValue.Length; i++)
{
var MaxNetValue = StrategyNetValue.Take(i).Max();
double drawdown = 1 - StrategyNetValue[i] / MaxNetValue;
if (drawdown > MaxDD)
{
MaxDD = drawdown;
}
}
Console.WriteLine("Maximum drawdown of This Strategy is: {0}", MaxDD);
var AnnualReturn = Math.Log(StrategyNetValue.Last()) /
(Convert.ToDouble(Weeks) / 50);
Console.WriteLine("Annual Return of This Strategy is: {0}", AnnualReturn);
var StrategyReturn = NetValue2Return(StrategyNetValue);
Console.WriteLine("Standard Deviation of This Strategy is: {0}",
Statistics.StandardDeviation(StrategyReturn));
double[] BTmetrics = new double[3];
BTmetrics[0] = AnnualReturn;
BTmetrics[1] = MaxDD;
BTmetrics[2] = Statistics.StandardDeviation(StrategyReturn) * Math.Sqrt(50);
// Result analysis for AdjNetValue
/////////////////////
///
/// Backtest Metrics of Dynamic Strategy
///
/////////////////////
var ADJStrategyNetValue = Adj_netValue.ToArray();
double ADJMaxDD = 0;
for (int i = 1; i < ADJStrategyNetValue.Length; i++)
{
var MaxNetValue = ADJStrategyNetValue.Take(i).Max();
double drawdown = 1 - ADJStrategyNetValue[i] / MaxNetValue;
if (drawdown > ADJMaxDD)
{
ADJMaxDD = drawdown;
}
}
Console.WriteLine("Maximum drawdown of ADJ Strategy is: {0}", ADJMaxDD);
var ADJAnnualReturn = Math.Log(ADJStrategyNetValue.Last()) /
(Convert.ToDouble(Weeks) / 50);
Console.WriteLine("Annual Return of ADJ Strategy is: {0}", ADJAnnualReturn);
var ADJStrategyReturn = NetValue2Return(ADJStrategyNetValue);
Console.WriteLine("Standard Deviation of This Strategy is: {0}",
Statistics.StandardDeviation(ADJStrategyReturn));
double[] ADJBTmetrics = new double[3];
ADJBTmetrics[0] = ADJAnnualReturn;
ADJBTmetrics[1] = ADJMaxDD;
ADJBTmetrics[2] = Statistics.StandardDeviation(ADJStrategyReturn) * Math.Sqrt(50);
// Output all results to CSV
// Without position adjustment
SaveArrayAsCSV_(trading_history_allocation, "StrandardTradingHistoryAllocation.csv");
SaveArrayAsCSV(BTmetrics, "StandardBacktestMetrics.csv");
SaveArrayAsCSV(StrategyNetValue, "StandardNet_value.csv");
// With position adjustmnet
SaveArrayAsCSV_(ADJtrading_history_allocation, "DynamicTradingHistoryAllocation.csv");
SaveArrayAsCSV(ADJBTmetrics, "DynamicBacktestMetrics.csv");
SaveArrayAsCSV(ADJStrategyNetValue, "DynamicNetValue.csv");
SaveArrayAsCSV_ <string>(trading_history_ETF, "ETFTradingHistoryforALL.csv");
Console.ReadKey();
}