Reducing Moving-Average Whipsaws by Filtering Choppy Markets
Summary
The document considers whether a price crossing a moving average can avoid repeated trades during sideways, choppy conditions while still capturing sustained trends. It explains the underlying trade-off: trend-following signals tend to enter and exit late, and sideways markets can produce false signals. Because such indicators are derived from past price and volume, they cannot establish whether a reversal will become a lasting trend or more chop.
Two possible responses are discussed. Smoother moving averages may reduce noise but add lag, and the document offers no evidence that they improve performance. Alternatively, a trader could filter out choppy conditions using a threshold on the Choppiness Index. This is a suggested technique, not a demonstrated result; the document provides no backtest, threshold value, or asset-specific guidance. Any filter should therefore be evaluated against the strategy’s intended market and trading costs.
Key ideas
- Trend-following indicators can capture sustained moves but often generate false signals in sideways markets.
- Smoothing a moving average may reduce whipsaws at the cost of greater lag.
- Past price and volume indicators cannot determine whether a new move will persist.
- A Choppiness Index threshold can be used as a proposed filter to avoid trading in choppy conditions.
- The document provides suggestions rather than evidence of improved performance.
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Full text
# Avoiding whipsaws of technical indicators # Avoiding whipsaws of technical indicators Let's say I have a simple strategy that involves going long on a stock whenever it rises above its 50 day moving average. As most are probably aware, this type of indicator works well in capturing sustained upward price movements and does equally well avoiding long downward price movements, but can get killed when price action is choppy. So a simple question - can threshold-type indicators be modified to avoid over-trading in times of choppiness while still staying true to the goal of being on the right side of the trade for extended price movements? ## Answer by Bob Baerker (score 2) https://quant.stackexchange.com/a/60270 If A is true then B is false and if B is true then A is false. You're asking for something that works when A is true and when B is true. It doesn't exist. Trend following indicators work well in trending markets. Well, sort of. They're late in and late out. They're not effective in sideways markets because they will generate false signals and whipsaws. Technical analysis indicators provide information like support and resistance, current trend, and current momentum but they are merely a reflection of past price and volume. They predict absolutely nothing going forward. It's like looking in the rear view mirror and expecting that to tell you where you are going. Any trade that you take based on such analysis is based on the HOPE that whatever trend or momentum you have identified will continue. Indicators predict absolutely nothing going forward so there's no way to know if the ensuing move after a reversal is going to be choppy or will be the beginning of a new trend. ## Answer by user42108 (score 1) https://quant.stackexchange.com/a/60272 You face a trade-off between 'smoothness' and lag. There are moving averages designed to address that (e.g. see John Ehlers work) but it's not clear they will offer a meaningful improvement in performance - though that's something you can check for yourself. ## Answer by Dave Skender (score 1) https://quant.stackexchange.com/a/64302 There are quite a few indicators that attempt to mitigate whipsaw. An alternate approach is to simply avoid trading in choppy price trends. For example, try pairing your strategy with the use of a threshold level on the Choppiness Index by E.W. Dreiss.
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