The 3-Day High/Low Method: A Simple, Yet Effective, Mean-Reversion Strategy

In the world of short-term trading, simplicity is often the ultimate sophistication. Larry Connors, a master of quantitative analysis, has a knack for distilling complex market behavior into simple, actionable trading strategies. His 3-Day High/Low Method, another gem from his book High Probability ETF Trading, is a perfect example of this principle in action.

The Psychology of the 3-Day High/Low Method

The 3-Day High/Low Method is based on the idea that a stock that has made lower highs and lower lows for three consecutive days is likely to be oversold and due for a bounce. This multi-day decline creates a climate of fear and pessimism, which often leads to a capitulation move on the third day. This is the point of maximum pain for the longs and maximum euphoria for the shorts, and it is precisely this environment where the 3-Day High/Low Method seeks to enter the market.

The Mechanics of the 3-Day High/Low Method

The 3-Day High/Low Method is a simple, yet effective, mean-reversion model. The rules are as follows:

Entry Rules:

1. Long-Term Trend Filter: The ETF must be trading above its 200-day simple moving average (SMA).
2. Three-Day Decline: The ETF must have made a lower high and a lower low for three consecutive days.

Exit Rules:

1. Reversion to the Mean: The position is exited when the ETF closes above the high of the previous day.

Risk Control and Money Management:

Consistent with Connors' other strategies, the 3-Day High/Low Method does not employ a traditional stop-loss. The risk is managed by the high probability of the setup and the expectation of a quick reversal. However, traders should always be mindful of their risk tolerance and may choose to implement a catastrophic stop-loss to protect against unforeseen events.

Backtesting and Performance

The 3-Day High/Low Method has been shown to be a robust and profitable model, particularly when applied to a portfolio of liquid ETFs. The strategy's strength lies in its ability to identify moments of extreme, multi-day selling pressure, which are often followed by a sharp and predictable reversal.

Backtesting has shown that the 3-Day High/Low Method can generate a high win rate and a solid profit factor. The key to its success is the combination of the long-term trend filter and the three-day decline. This ensures that we are only entering trades with a high probability of success.

The 3-Day High/Low Method in Practice

Imagine an ETF that is in a strong uptrend, trading well above its 200-day SMA. The ETF then experiences a three-day sell-off. On day one, the high is $100 and the low is $98. On day two, the high is $99 and the low is $97. On day three, the high is $98 and the low is $96. This triggers a buy signal. We enter a long position at the close of day three. The next day, the ETF rallies and closes at $99, which is above the previous day's high of $98. We exit the position, banking a quick and easy profit.

Conclusion

The 3-Day High/Low Method is a simple, yet effective, model for trading mean reversion. By identifying and exploiting the psychology of multi-day declines, traders can gain a significant edge in the market. As with any trading strategy, proper backtesting and risk management are essential for long-term success. But for those who are willing to do the work, the 3-Day High/Low Method can be a valuable addition to their trading arsenal.