Category Archives for System Development

Multiplex For Greater Profit

Two problems that often result from system optimization are:  (1) a reduction in the number of trades, a system that generates too few trades can both be more difficult to trade and a low number of trades does not inspire confidence; and… (2) there is a selectivity or specialization risk that, by sheer bad luck, the specific […]

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9 Mistakes Quants Make that Cause Backtests to Lie

“I’ve never seen a bad backtest” — Dimitris Melas, head of research at MSCI. A backtest is a simulation of a trading strategy used to evaluate how effective the strategy might have been if it were traded historically. Backtestesting is used by hedge funds and other researchers to test strategies before real capital is applied. Backtests […]

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Statistical Analysis For Exits

As system designers, we hit the problem that whilst it seems relatively straightforward to develop entries and then test them against arbitrary exits, the reverse is a lot trickier. I have found out that doing some very simple statistical analysis can help in exit rule development. Over the years it has appeared to me that […]

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Beginner’s Guide to Quantitative Trading

Quantitative trading

In this article I’m going to introduce you to some of the basic concepts which accompany an end-to-end quantitative trading system. This post will hopefully serve two audiences. The first will be individuals trying to obtain a job at a fund as a quantitative trader. The second will be individuals who wish to try and set […]

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Are you losing when you should be winning? Here’s something you might be missing

Most people think about where to get into and out of positions. Nearly all traders know how important it is to follow their rules, and the majority of them always work toward being more disciplined. These are important pieces of a successful investment strategy, and most traders work on these things. But there’s one thing […]

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Broken Strategy or Market Change: Investigating Underperformance

Broken Strategy

I recently had someone email me about the performance of a strategy I created back in late 2005/early 2006 and traded for a few years. I remember the strategy being a daily mean reversion set up with an intraday pullback entry. I figured it probably had not done well over the last decade. I stopped […]

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