Systematic trading seeks out diversification to achieve more even returns while controlling risk. One way to diversify is to trade different models. But is trading different models enough?
Two systematic trading styles that are often thought of as polar opposites are trend-following and mean reversion. Using simple stylized trading signals, we show that even different models can align at times. Or to paraphrase “one person’s trend is another’s reversion”, where timescales over which market moves are observed matter.
Our trend signal is a medium speed moving average crossover (MaCo), while our mean reversion signal is a very slow MaCo with a multiplicator of -1. Strong positive MaCo values for the latter therefore lead to a negative overall signal for the reversion model, and vice versa.
We show signals, alongside futures prices, for two markets, the S&P 500 and the US 10Yr T-Note. Green shading indicates alignment in signal direction for trend and reversion. Coming into 2022, equities had seen years of appreciation, with the reversion signal seeing markets as overvalued and expecting a return to a long-term equilibrium price. Early in 2022, markets corrected, with trend aligning itself with the reversion signal, which got continuously weaker as prices declined.
A similar picture emerges for bonds. With rates at historic lows right into the early days of the Covid pandemic in mid-2020, bond prices had only known one way in years – up. Rate hikes have since put pressure on bond prices, and we see a fairly steady decline in the US 10 Yr T-Note up until recently. The reversion signal has been short for years, with the strongest signal in mid-2020, indicating that bonds were far above fair value. As prices declined, trend gradually cut its long position and has aligned itself frequently with the reversion signal.
These two examples show that even models that are designed to capture very different market scenarios can look very similar at times. Thoughtful portfolio construction that takes into account such correlations ensures we do not double down on any one signal.
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