Over the last four articles people have been writing in, asking, “How do you deduce leverage from your backtests?” “How do you actually implement leverage in your trading?” “How do you calculate position size?” “How often do you rebalance?” So, to keep this series as hands on and close to reality as possible, this article […]

## Equities and Their Mean Reversion Habits

At last! We’ve made it to the mean-reverting part of the series, starting with our focus on equities and their mean-reversion habits. So, here’s the deal. We’re going to keep it simple, just like in the previous three posts, and start from the ground up. Over the following series we’ll culminate in a simple, straightforward […]

## Dangers of Backtesting, Over-Leverage and the Need for a Protective Stop

Backtesting and Over-Leverage are the bane of any systematic trader. A shout out to Peter who raised both these points on the previous article in the series: Trading Numbers So, what are the two issues we’ll address in this week’s article: Look ahead bias, and is it really that bad? Kelly is always touted as […]

## Taking Control of Your Trading Numbers

Taking Control of Your Trading Numbers – that means actually being able to replicate the results that others produce. It’s the only way to be sure that you know what’s going on. Well, many people got back after last week’s article asking about the details of the calculations as well as about some of the […]

## SPY 12 Month Momentum Filtered Backtest in Excel

Taking control of your trading numbers is very important. Here is an example of how straight forward it can be to run backtests in Excel. If you want to follow along in the article series, follow the link: Taking Control of Your Trading Numbers