Last week I posted a description of Ken Calhoun’s Closing Range trading system. Now I’ll go through the process of backtesting the system itself and comparing my theories about what data points would affect it’s profitability.
A brief overview of the system itself. It looks for a breakout in the first 15 minutes above the closing 30 minute range from the prior day and uses a stop at the bottom of the closing range. Pretty simple:
As I suspected, the system puts out a LOT of trades. Including all these trades produces some pretty poor results, so the question becomes under what circumstances should you take trades. That is, which trades from the system should you actually take and which ones should you ignore?
Is it even possible to find a profitable subset of trades from this system with an equity curve that looks that bad? You might be surprised. Let’s take a look.
Which Filters to Use?
I suggested in my last post that the filters that would make the most difference in this system would be:
- The height of the closing range
- The opening gap/immediate trading action
So let’s look at each of these.
Height of Closing Range
When you look at the height of the closing range you see that it has increasing profitability the larger the value is. Here’s a chart of the equity curves for each range of the values.
The purple line represents the trades with the highest closing range height values in the trade set. The smaller the values, the worse the trades.
One filter I look at in almost every system I examine is volatility. How much does this stock move normally, outside of the day in question? Stocks that typically move more in general are more profitable to trade. But wait – we’re trading this event that’s already unusual by definition – does it really matter what it does on a normal day? Why?
Because stocks tend to revert back to the normal character, so even on unusual days this tendency will still exist. Given the fact that this trading strategy has relatively few requirements for “unusualness” anyway, it will likely revert to normal even more so. Here I use Average True Range (ATR) for my measure of volatility.
Notice that the highest levels of values for Average True Range are the most profitable (the purple line). All lower values tend to be grouped together. Also note that all these lines each represent the same number of trades.
I thought that the opening gap would be important for this trading system. Imagine a large, meaningful gap down. Just how important can the closing range from yesterday really be in that situation? The more meaningful the gap, the less meaningful the closing range.
Sure enough you see another strong correlation here. Literally the bigger the gap the worse the trades perform. The smaller gaps represented by the red line are actually starting to look like a system you could trade!
What to Look at Next?
There are other filters I’d want to look at next, but I believe the improvement gains from additional filters would be smaller and less obvious.
What other filters do you think would be worth examining? Let me know in the comments and I’ll try to test them and post an update.