The "N" Factor: How William Eckhardt Used Volatility to Normalize Risk and Maximize Returns

In the intricate world of trading, where risk and reward are in a constant dance, the ability to accurately measure and manage risk is what separates the successful from the struggling. William Eckhardt, with his mathematical prowess, introduced a concept to the Turtles that was revolutionary for its time and remains a cornerstone of sophisticated risk management today: the "N" factor. This seemingly simple metric, a measure of a market's volatility, was the key to accessing a new level of precision in position sizing and diversification, allowing the Turtles to navigate the turbulent waters of the markets with a level of control that was previously unimaginable.

At its core, "N" is simply the 20-day Average True Range (ATR). The True Range, a concept developed by J. Welles Wilder Jr., is a measure of a market's daily volatility that accounts for any gaps in price from one day to the next. It is the greatest of the following: the distance from the current day's high to the current day's low, the distance from the current day's high to the previous day's close, or the distance from the current day's low to the previous day's close. By taking a 20-day moving average of the True Range, Eckhardt and Dennis created a smoothed-out, reliable measure of a market's recent volatility. This was their "N," and it became the fundamental unit of risk for the Turtle Trading system.

The genius of the "N" factor lies in its ability to normalize risk across a wide range of different markets. The Turtles traded everything from quiet, slow-moving markets like Treasury bonds to wild, volatile markets like crude oil. A $1,000 move in Treasury bonds is a much different event than a $1,000 move in crude oil. By using "N" as the basis for their position sizing, the Turtles were able to equalize the risk of each position, regardless of the market they were trading. They sized their positions so that a 1N move in price would equal 1% of their account equity. This meant that they would take a much larger position in a low-volatility market than they would in a high-volatility market, but the risk of each position, as a percentage of their account equity, would be identical. This is a far more sophisticated approach to position sizing than simply trading a fixed number of contracts or shares, and it is a key reason why the Turtles were able to achieve such consistent results across a diversified portfolio.

This risk normalization had a profound impact on the effectiveness of their diversification strategy. Diversification is often misunderstood as simply spreading your capital across a number of different assets. But true diversification is about spreading your risk. By ensuring that each position had a similar level of risk, the Turtles were able to create a truly diversified portfolio, where no single position could have an outsized impact on their overall equity. This is a important concept for any trader who is looking to build a robust and resilient trading system.

Furthermore, the concept of "N" is fractal in nature, meaning that it can be applied to any timeframe. While the Turtles used a 20-day ATR for their daily charts, the same principle can be used for weekly, monthly, or even intraday charts. The key is to use a measure of volatility that is appropriate for the timeframe you are trading. This makes the "N" factor a universally applicable tool for risk management, regardless of your trading style or time horizon.

In conclusion, the "N" factor is a evidence to William Eckhardt's brilliant and innovative approach to trading. It is a simple yet effective tool that allows traders to measure and manage risk with a level of precision that was previously unattainable. It is a reminder that in the world of trading, it is not enough to have a good entry and exit strategy; you must also have a robust and sophisticated approach to risk management. And for that, there is no better tool than the "N" factor.