Robustness Checks for a Century-Long Industry Trend-Following Strategy

Summary

This study revisits a long-only trend-following strategy covering industries, previously reported to have strong historical returns and risk-adjusted performance. It asks whether those results remain persuasive under practical implementation choices and changing market conditions. The review examines the strategy’s reliance on Treasury bills, alternative fallback allocations, and the exclusion of particular industries.

The study also considers momentum signals, parameter optimization, and Walk-Forward Analysis as ways to improve adaptability. Despite these modifications, the reported findings emphasize persistent difficulties in making the historical strategy robust to modern markets. The description gives no detailed performance figures for the revised versions, test periods, or comparison methodology beyond citing the original strategy’s reported results. It therefore supports caution about assuming past industry trends will persist, but does not identify a modification that reliably resolves the robustness problem.

Key ideas

• The study revisits a historical long-only trend-following strategy applied to industries.
• It examines dependence on Treasury bills, alternate fallback allocations, and industry exclusions.
• Momentum signals, parameter optimization, and Walk-Forward Analysis are considered as adaptations.
• The reported results point to continuing robustness challenges in modern market conditions.
• The document does not specify which tested modification, if any, improves performance reliably.

Tags

# Refining and Robust Backtesting of A Century of Profitable Industry Trends


# Refining and Robust Backtesting of A Century of Profitable Industry Trends









We revisit the long-only trend-following strategy presented in A Century of Profitable Industry Trends by Zarattini and Antonacci, which achieved exceptional historical performance with an 18.2% annualized return and a Sharpe Ratio of 1.39. While the results outperformed benchmarks, practical implementation raises concerns about robustness and evolving market conditions. This study explores modifications addressing reliance on T-bills, alternative fallback allocations, and industry exclusions. Despite attempts to enhance adaptability through momentum signals, parameter optimization, and Walk-Forward Analysis, results reveal persistent challenges. The results highlight challenges in adapting historical strategies to modern markets and offer insights for future trend-following frameworks.

Shown in full with attribution under the source's licence. Licence: abstract CC0

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.