How do I simulate if then statements for the simulator?

How do I simulate if then statements for the simulator?

Bain
2013-01-22 00:23:43

I want to backtest a strategy with the following rules but I do not know how to program it into quantshare:

Daily Strategy:

Buy VXX Short VXZ if VXX/VXZ > 1.1; Close positions at end of day
Buy VXZ Short VXZ if VXX/VXZ < 0.9; Close positions at end of day

QuantShare
2013-01-22 09:41:26

In "Symbols & Dates" tab, add VXX and VXZ symbols.
In the strategy formula, type:

a = GetSeries("VXX", close);
b = GetSeries("VXZ", close);
ratio = a / b;

buy = iff(stringequal(name(), "VXX") and ratio > 1.1, 1, 0);
short = iff(stringequal(name(), "VXZ") and ratio > 1.1, 1, 0);

buy = iff(stringequal(name(), "VXZ") and ratio < 0.9, 1, 0);
short = iff(stringequal(name(), "VXX") and ratio < 0.9, 1, 0);

For more advanced "if then" statements, you can either create a custom indicator or you can use the money management script.

Alpha Trader
2013-04-23 01:27:02

I have a similar question. I'm trying to backtest a system that looks at SPY and IWM but with different parameters. I'd like to use the C# method of If in the simulator... or any other method..? Here's what I was hoping would work, but apparently it doesn't like the statement. Would the "Choose" Function work somehow?

if(Name()== %u201CSPY%u201D)
{
op0 = 80;
op1 = 50;
}

if(Name()== %u201CIWM%u201D)
{
op0 = 80;
op1 = 50;
}

Rule1 = (Close) > (SMA(Close,op0));
Rule2 = (Close) < (SMA(Close,op1));

buy = (Rule1);
sell = (Rule2);

Thanks!

Alpha Trader
2013-04-23 01:27:57

- Correction -
if(Name()== %u201CIWM%u201D)
{
op0 = 200;
op1 = 200;

}

Alpha Trader
2013-04-23 01:29:12

Full Correction -

if(Name()== "SPY")
{
op0 = 80;
op1 = 50;
}

if(Name()== "IWM")
{
op0 = 200;
op1 = 200;
}

Rule1 = (Close) > (SMA(Close,op0));
Rule2 = (Close) < (SMA(Close,op1));

buy = (Rule1);
sell = (Rule2);

Thanks!

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QuantShare
2013-04-23 10:01:48

QS language doesn't support "if(...){...}". If you want to use C#, you will have to create a custom function or use the money management script.

With QS language, you can implement your strategy by typing:

op0 = iff(stringequal(name(), "SPY"), 80, 200);
op1 = iff(stringequal(name(), "SPY"), 50, 200);

Rule1 = (Close) > (SMA(Close,op0));
Rule2 = (Close) < (SMA(Close,op1));

buy = (Rule1);
sell = (Rule2);

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