Backtest different Segments in your Trading System

This function allows you to enter several criteria (segments) and an index. It then calculates the result of the segment referenced by the index.

Let us say that for example, you want to create two segments:
Overbought Stocks
Oversold Stocks

The formula for each segment is:
rsi(14) > 70
rsi(14) < 30

Here is how to use this function:
a = segment("rsi(14) > 70;rsi(14) < 30", -1);
b = segment("rsi(14) > 70;rsi(14) < 30", 0);
c = segment("rsi(14) > 70;rsi(14) < 30", 1);

The variable "a" will get the number of segments, which is "2" in this case. This is a special case: by specifying a negative index, the "segment" function returns the number of segments.
The variable "b" will calculate the first segment and return the result of the following function: rsi(14) > 70
The variable "c" will calculate the second segment and return the result of the following function: rsi(14) < 30


How could it be useful?

This trading indicator can be really useful if you want to optimize for example a trading system by testing several rules/segments.

Optimize("a", 0, 1, 1);
rule1 = segment("rsi(14) > 70;rsi(14) < 30", a);

buy = close > close[1] and rule1;


By optimizing the above trading system, QuantShare will backtest two trading systems:
1/ Price is higher than yesterday's price and stock is overbought
2/ Price is higher than yesterday's price and stock is oversold

You can of course add as many segments as you want. And you can also combine segments by creating several calls to the "segment" function.

Another example:

Optimize("a", 0, 1, 1);
Optimize("b", 0, 2, 1);
rule1 = segment("rsi(14) > 70;rsi(14) < 30", a);
rule2 = segment("close > 2;close > 10;close > 20", b);

buy = close > close[1] and rule1 and rule2;

// The above trading system will create 6 combinations

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