Recently, while checking the chart, I’m reminded of the divergence rate indicator again. To be honest, many people’s understanding of it is still at the textbook level, but in real trading, knowing how large the divergence rate needs to be is the real key you must master.

Simply put, the divergence rate is a tool for measuring the distance between the price and the moving average. The formula is very simple: take the day’s closing price minus the N-day moving average, then divide by the moving average and multiply by 100%. If the result is positive, it indicates a premium; if it’s negative, it indicates a discount. The problem is that there is no absolute answer to how large the divergence rate counts as “large”—you must judge it based on the market’s characteristics.

I’ve gathered data across many markets. Large indices like the S&P 500 usually consider 3-5% as extreme, but for crypto assets like Bitcoin, it may need to reach 8-10% to be the truly overbought/oversold zone. Gold typically falls between 2-5%. So as you can see, the same number can mean completely different things in different markets.

Many traders ask me how large the divergence rate should be before entering. My suggestion is to spend time backtesting the historical price action of the specific asset you’re following, and then identify its range of extreme values. For example, when I trade the S&P 500, I mark the 3-5% range on the chart. When the divergence rate drops below -5%, I start to pay attention, but I don’t move to a full position immediately—instead, I scale in in batches.

In real practice, I’ve found that combining the divergence rate with candlestick patterns works better. When the divergence rate is at an extreme value and you see a lower shadow, it’s often a decent entry signal. Also, divergence is important—especially bullish divergence. When the price makes a new low but the divergence rate doesn’t make a corresponding low, it usually suggests that selling pressure is starting to dry up.

However, you should note that in strong uptrends, the divergence rate tends to lose sensitivity. Sometimes, the divergence rate is already very large, yet the price is still moving sideways or continuing to rise. That’s why I say indicators are only auxiliary—trend is the main focus. When you encounter this kind of situation, rather than fixating on how large the divergence rate is, it’s better to look at other signals in combination.

For parameter settings, short-term traders can use the 5-day or 10-day moving average, swing traders may find the 20-day moving average more suitable, and long-term investors often use the 60-day seasonal moving average. Different trading timeframes require different parameter combinations.

Overall, the core logic of the divergence rate is that price will eventually revert to the mean. But in strong market conditions, this mean reversion may take a very long time, and the price may repeatedly oscillate near extreme levels. So, in the end, deciding how large the divergence rate counts as “large” still comes down to the market environment and your personal risk tolerance—it shouldn’t be applied mechanically by plugging in a number.