The most common misunderstanding about the Coppock Curve is treating it as a "bottom-fishing signal light": when the curve crosses above the zero line from below, people think the bottom has arrived and they can enter the market. The original purpose of this indicator was indeed to find long-term buying opportunities, but it is a lagging indicator. By the time the signal appears, the market has often already risen for a while. Using it as a supplementary tool to "confirm that the trend has turned" is completely different from using it as precision guidance to "predict where the bottom is." The "bottom-fishing mistakes" in the title come from the latter.
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What It Actually Calculates
The formula itself is not complicated: Coppock Curve = 10-period Weighted Moving Average (WMA) of (14-period Rate of Change + 11-period Rate of Change). The Rate of Change (RoC) measures how much the current price has changed relative to the price several periods ago. Adding the two RoC values together and then smoothing them is meant to filter out short-term noise and leave only the long-term momentum direction.
Traditional usage is based on monthly charts. When Edwin Coppock designed this indicator in the 1960s, he heard from a priest that people need an average of 11 to 14 months to grieve for the deceased. He speculated that the market's "mourning period" after a major decline would be about the same length, so he chose the 11 and 14 periods. This origin story is often quoted, but it does not constitute a reason for the indicator's effectiveness. What is really worth noting is that monthly-level parameters mean it produces only a few signals per year, making it naturally unsuitable for short-term and swing trading.
In the crypto market, some people shorten the periods, such as changing 14 to 6, on the grounds that "crypto market cycles are shorter." This adjustment is neither right nor wrong, but you need to understand the cost: the shorter the period, the more frequent the signals, and the more false signals there will be. Gate's encyclopedia page suggests that traders test different parameters according to their own strategies rather than assuming the default values are suitable for all assets.
Turning Point Signals: Watch the "Zero Line Crossover," but Don't Only Watch That
The standard usage is: when the curve crosses above the zero line from below, it is considered a long-term buy signal. StockCharts explains that Coppock uses monthly data and looks for buy points when the indicator moves from negative territory into positive territory. Investopedia's wording is more direct: above zero is a buy signal, below zero is a sell signal.
But the "zero line crossover" is only a binary judgment. It discards information about where the curve was before the crossover. An analysis by Tatton Investment Management points out a detail that most brief explanations overlook: the deeper the negative starting point of the signal, the greater the potential upside afterward. In other words, if the curve climbs up from a very deep negative area and crosses the zero line, the historical implication is not the same as when it barely turns positive from a position close to zero like -0.2.
A more practical approach is to combine the zero line crossover with the direction of the curve. When the curve is below zero but has already started to turn upward, that is an early sign that "momentum is repairing." When the curve crosses the zero line, that is confirmation that "the repair has already happened." The former is earlier but more uncertain; the latter is later but more reliable. Which one you choose to watch depends on how much lag you are willing to trade for how much certainty.
Bottom-Fishing Mistakes: It Doesn't Tell You Where the Bottom Is, Only That the Downtrend May Be Ending
This is the most important part of the title to clarify. The Coppock Curve has confirmed many major bull market starting points in U.S. stock data since the 1920s, but it also has false signals. Tatton's article mentions two failed signals in 1941 and November 2001. The 2001 one is especially noteworthy: the Coppock Curve turned positive at the end of 2001, but the S&P 500 fell another roughly 30% in the fall of 2002. If someone saw the signal at the end of 2001 and tried to "bottom-fish," they would have suffered considerable unrealized losses for nearly a year.
What this case illustrates is not that "the indicator is useless," but that "the scope of the indicator's promise is limited." The Coppock Curve captures directional changes in momentum, not the lowest point of price. When it turns positive, the market may have already moved away from the lowest point, or it may just be a temporary rebound within a larger downtrend. It cannot distinguish between these two situations because its only input is the rate of change of price. It has no information about valuation, liquidity, or macro conditions that could distinguish a "rebound" from a "reversal."
In the crypto market, this limitation is amplified. The volatility of crypto assets is far higher than U.S. stock indices. Monthly-level RoC may turn positive after one violent but brief rebound, and then the price continues to make new lows. If you treat a positive Coppock crossover as "bottom confirmation" and enter with a heavy position, the drawdown from such a false signal will be quite painful.
My Judgment: Where to Position It
If you are doing long-term allocation at the monthly or weekly level, the Coppock Curve can serve as a filter: when it is still below zero and pointing downward, you should be more restrained in your urge to "bottom-fish"; when it turns upward from a deeply negative area and crosses the zero line, you can use "the market may have passed its worst stage" as a reference, but do not treat it as the only basis for entry. Looking at it together with longer-term trend indicators (such as whether the price is above the 200-day moving average) is more meaningful than looking at it alone.
If you are trading on daily or shorter timeframes, the default parameters of this indicator are basically useless. Its signal frequency is too low. By the time you see a signal, the short-term opportunity has long passed. Changing parameters can increase frequency, but false signals will also increase accordingly. A practical analysis targeting forex and stock markets points out that the Coppock Curve generates a large number of false signals in ranging markets, and even in trending markets, the marginal advantage obtained from trading signals is likely to be eaten up by commissions and slippage.
If you are looking for a tool for "precise bottom-fishing," the Coppock Curve is not that thing. No single indicator can reliably predict the lowest point of price. Its value lies in telling you in a smoothed way that "downward momentum is weakening," not telling you "this is the bottom right now."
Verification Methods
If you are looking at the Coppock Curve in TradingView or on an exchange's charting tool, first confirm two things: whether the timeframe is monthly or weekly, and whether the parameters use the default 10/11/14 or have been changed. Gate's tutorial mentions that in TradingView, you can hover over the indicator name, click settings, and adjust the lengths of the WMA and RoC. After changing them, the new parameter values will be displayed next to the label. If the parameters have been changed, the curve you see is not the same thing as the "standard Coppock" discussed in historical articles, and the frequency and reliability of signals will be different.
Another verification point is the timing of the zero line crossover. If you see an analysis saying "Coppock just turned positive," go to the chart and confirm where the curve actually crossed the zero line. If the curve repeatedly crosses back and forth near the zero line, it means the momentum direction is not clear, and the value of a "positive crossover" signal in that situation is very low. A true trend reversal signal usually corresponds to a clean, sustained crossover, not back-and-forth friction near the zero line.
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References
- Angel One·What is Coppock Curve, page publication or update date: not indicated on page; verification date: 2026-10-20.
- StockCharts·Coppock Curve, page publication or update date: not indicated on page; verification date: 2026-10-20.
- Investopedia·Coppock Curve, page publication or update date: not indicated on page; verification date: 2026-10-20.
- Investopedia·Using the Coppock Curve to Generate Stock Trade Signals, page publication or update date: not indicated on page; verification date: 2026-10-20.
- Gate.com·Coppock Curve Indicator, page publication or update date: 2026-01-16; verification date: 2026-10-20.
- Tatton Investment Management·Can you time the market?, page publication or update date: not indicated on page; verification date: 2026-10-20.
- Investing.com·Chi dice che il market timing non si può fare?, page publication or update date: not indicated on page; verification date: 2026-10-20.
- ATAS·The Coppock Curve indicator: How to use it?, page publication or update date: not indicated on page; verification date: 2026-10-20.
