I recently completed a third year of back testing the SPX Ratio Spread on the SPY Detector signals. Without any changes to the rules or the signals, 2012 had remarkably similar results to the previous two years which were much more volatile. Here is some documentation for this back test: PDF Overview: SPX Ratio Spread Back Testing Results – Part 2 … Read More
Volatility-Based Sizing
In running back tests, it’s important to understand the impact of volatility and position size. A consistent position size in number of shares or dollar amount can greatly skew historic results. If optimizing, this may lead to curve-fitting the system to periods of high volatility. Here are some examples of the impact of fixed-position sizing vs volatility-based sizing: The first … Read More