Systematic Trading: A Unique New Method for Designing Trading and Investing Systems

Author: Robert Carver | Categories: Systematic Trading, Portfolio Management, Risk Management, Quantitative Trading

Executive Summary

"Systematic Trading" by Robert Carver, published in 2015 by Harriman House, presents a comprehensive framework for designing trading and investing systems that applies to everyone from passive asset allocators to fully systematic futures traders. Carver, a former portfolio manager at AHL (one of the world's largest systematic hedge funds) who managed their multi-billion dollar fixed income portfolio, brings institutional-grade thinking to a book accessible to individual investors.

The book's central innovation is a unified framework that serves three distinct audiences: asset allocating investors who want to avoid behavioral pitfalls, semi-automatic traders who want to combine discretionary views with systematic risk management, and staunch systems traders who want fully automated rule-based trading. Carver's refreshingly honest admission -- "I am very bad at making financial decisions" -- establishes the rationale for systematization: removing emotion from trading decisions to improve consistency and performance.

Core Thesis & Arguments

Carver's central thesis is that systematizing financial decision-making improves outcomes for all types of traders and investors, not just quantitative specialists. He argues that even investors who believe they can outperform simple rules should use a systematic framework for position sizing and risk management.

Key arguments include: (1) Complexity in trading systems reduces rather than increases validity -- simple rules outperform complex ones. (2) The greatest source of trading edge for most people is not prediction but proper risk management and position sizing. (3) Backtesting is dangerous without proper methodology, and most backtested systems are over-fitted. (4) The same framework can serve discretionary, semi-systematic, and fully systematic approaches. (5) Costs (commissions, spreads, market impact) are critically important and must be incorporated into system design from the start.

Chapter-by-Chapter Analysis

The book progresses from theoretical foundations through practical implementation:

Part One: Theory covers the rationale for systematic trading, the three types of systematic traders, and the theoretical framework including forecasting, risk targeting, and position management.

Part Two: Toolbox provides the practical tools: trading rules (trend following, carry, mean reversion), methods for combining multiple rules and instruments, proper backtesting methodology, and risk management frameworks.

Part Three: Framework brings everything together for each audience: how to build an asset allocation system, a semi-automatic trading system, and a fully systematic trading system, with specific examples and parameter recommendations.

Key Concepts & Frameworks

• The Three Audiences: Asset allocating investors, semi-automatic traders, and staunch systems traders -- each using the same core framework with different inputs.
• Forecast Scaling and Capping: Methods for normalizing and combining predictions from multiple sources (rules, discretionary views) into a consistent position sizing framework.
• Risk Targeting: Setting an annual volatility target and using it to determine position sizes, ensuring consistent risk regardless of the instrument traded.
• Handcrafting: Carver's method for determining portfolio weights without relying on unstable optimization, using simple rules that approximate optimal allocation.
• Instrument Diversification Multiplier: A factor that accounts for the imperfect correlation between instruments in a portfolio, allowing for increased position sizes.
• Fitting versus Over-fitting: The critical distinction between finding genuine patterns and curve-fitting to noise, with practical guidelines for avoiding the latter.

Practical Trading Applications

1. Set an explicit annual volatility target for your portfolio and size all positions to achieve it, rather than using arbitrary position sizes.
2. Use multiple uncorrelated trading rules and combine their signals rather than relying on a single indicator or approach.
3. Incorporate trading costs into your system design from the beginning -- a strategy that looks profitable before costs may be a net loser after costs.
4. Even if you use discretionary judgment for trade direction, use a systematic framework for position sizing and risk management.
5. Prefer simple, robust trading rules with few parameters over complex models that are likely over-fitted to historical data.
6. Diversify across as many uncorrelated instruments as practically possible to reduce portfolio-level risk.

Critical Assessment

Strengths: The book's unified framework is genuinely innovative and applicable to a remarkably wide range of trading and investing styles. Carver's institutional background gives him credibility and practical insight that most system trading books lack. The honest treatment of costs, over-fitting, and the limitations of backtesting is refreshing. The three-audience approach ensures broad applicability.

Weaknesses: The mathematical content, while not advanced, may challenge readers without a quantitative background. The book is dense and requires careful study. Some of the specific implementation details (instrument weights, forecast scaling) may feel abstract without hands-on practice.

Best for: Anyone who wants to incorporate systematic methods into their trading or investing, from passive investors seeking better asset allocation to active traders building fully automated systems. Particularly valuable for traders transitioning from discretionary to systematic approaches.

Key Quotes

"I am very bad at making financial decisions. Like most people I find it difficult to manage my investments without becoming emotional and behaving irrationally."

"In every case the accuracy of experts was matched or exceeded by a simple algorithm."

"Creating a trading system removes the emotion and makes it easier to commit to a consistent strategy."

"The distinction some people draw between financial gambling, trading and investing is completely meaningless: they all involve taking financial risk on uncertain outcomes."

Conclusion & Recommendation

"Systematic Trading" is one of the most practical and intellectually honest books on system design available. Carver's unified framework, institutional perspective, and candid treatment of the limitations of both systematic and discretionary approaches make this book valuable for virtually any market participant. Whether you are a passive investor seeking to avoid behavioral mistakes, a discretionary trader looking for better risk management, or a quantitative trader building automated systems, this book provides a robust, well-tested framework that can be immediately applied.