Recently, many people have been asking about technical indicators, so I want to discuss a tool that many traders overlook but is actually very practical — the divergence rate.

Simply put, divergence means the distance between the price and the moving average. Why should we pay attention to this? Because the market follows a pattern: no matter how much prices rise or fall, they will eventually return to the average cost. The divergence rate is an indicator used to catch this mean reversion opportunity.

First, understand what a moving average is. Essentially, it’s the average price over a past period. When the price deviates too far from the moving average, it indicates the market has entered an extreme state. The calculation formula for divergence rate is actually simple: (Closing price of the day − N-day moving average) ÷ N-day moving average × 100%. A positive result is called positive divergence (premium), and a negative result is negative divergence (discount).

Honestly, divergence will always exist. Because moving averages are lagging, they respond more slowly to price changes, so the divergence rate value is the key.

When reading the divergence rate, the most important thing is the zero line. Bias = 0 means the price equals the moving average. When greater than 0, it indicates a bullish strength; less than 0, the market is being suppressed by the moving average. But don’t just look at the number; consider the degree. Moderate positive divergence indicates an uptrend, while extreme positive divergence is a sign of overbought conditions; moderate negative divergence shows weakness, and extreme negative divergence indicates oversold conditions.

So, what counts as extreme? There’s no standard answer; it depends on market characteristics. For example, for the 15-day divergence rate, the S&P 500 is roughly 3-5%, Bitcoin 8-10%, gold 2-5%. But these are just references; different assets vary greatly, so you must backtest yourself.

Sometimes, just looking at extreme values isn’t enough; you can combine divergence signals for double confirmation. Top divergence occurs when the price hits a new high but the divergence rate doesn’t, indicating momentum may be weakening; bottom divergence occurs when the price hits a new low but the divergence rate doesn’t, usually a sign of a bottom rebound.

I recommend not relying solely on the divergence rate for trading. It’s just a warning light indicating the price has deviated too far and may revert. Use it as a caution signal. When the S&P 500 divergence rate hits -5%, you can gradually enter long positions, rather than leverage heavily or hold a full position.

The practical approach is: first, review the historical trend of the asset, mark the extreme value ranges. Then, combine it with RSI or price action. For example, when RSI enters oversold territory and the divergence rate is at an extreme negative value, observe whether there are signs of a bottoming out before considering entry.

Regarding parameter settings, the default is usually 6, 12, or 24 days, but in practice, traders often use moving averages that fit market habits. Short-term traders use 5-day or 10-day moving averages to catch very short-term fluctuations; swing traders use 20-day moving averages to judge medium-term trends; long-term investors use 60-day moving averages to observe overbought or oversold conditions over larger cycles.

The most practical trading strategy is combining extreme values with candlestick reversals. During a continuous decline, if the divergence rate significantly deviates from the extreme value, although you can’t precisely predict which candlestick will reverse, this area has historically been a low point. When a lower shadow appears, consider entering in batches to average down.

Another is the bottom divergence strategy. In markets like the S&P 500, which tend to rise long-term, if the price breaks below a previous low but the divergence rate doesn’t hit a new low, that’s a bottom divergence entry opportunity. If the bottom divergence occurs outside the extreme value range, the success rate is higher. But remember, don’t look for top divergence at lows or bottom divergence at highs, or you’ll get caught in a strong trend reversal.

Common questions: How much divergence is normal? There’s no absolute standard; it depends on market characteristics. For the S&P 500, -3% to +3% is usually considered normal fluctuation. Does divergence rate work? Of course, it’s popular because it’s reliable, but in a strong trend, it may become less effective. Use multiple signals for confirmation. What if the divergence rate is large but the price is sideways? That indicates the price may not immediately revert to the mean. In a strong bull market, sideways movement often replaces decline, then a new upward wave begins.

Finally, I want to emphasize that divergence rate is just an auxiliary tool; the trend is the main focus. In a strong unilateral trend, prices can deviate significantly before returning to normal. Indicators can deceive, but market laws won’t: prices will eventually revert to the mean, which is what divergence indicates.