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Handling Nonstationary Spreads in Pairs Trading

Article Quant Q&A · Author: aajkal
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Summary

The document asks what to do when a hedge ratio in a pairs trade appears to produce a stationary, mean-reverting spread in most cases, but a trend remains in other cases. It asks whether the trend can be accounted for or removed to make the spread stationary. This frames a model-selection and validation problem: the apparent behavior of the spread may vary across samples or regimes, so a single hedge ratio may not support the same trading premise throughout.

No proposed detrending procedure, test results, or trading rules are included. The question also does not specify the assets, sample window, hedge-ratio estimation method, or stationarity test. Consequently, it is a prompt for further analysis rather than evidence that a trend should simply be removed; blindly detrending could change the relationship being evaluated.

Key ideas

  • A hedge ratio may yield a mean-reverting spread in some cases and a trending spread in others.
  • The document asks how to address apparent nonstationarity in a pairs-trading spread.
  • It supplies no detrending method, diagnostics, or evidence that removing a trend is appropriate.
  • Asset choice, estimation window, and testing method are unspecified.

Tags

Pairs tradingMean reversionStatistics
Full text
# pairs trading detrend the spread


# pairs trading detrend the spread












I have calculated a hedge ratio that generates a mean reverting spread (stationary, without trends) 60-70% of the time. But the remaining 30% of the time, it seems like there is a trend in the spread. How do I handle such a case? Is there a way to account for that or make the spread stationary without trends?

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