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Mean Reversion vs Trend Following, Choosing the Right Mode

Markets alternate between trending and ranging, and strategies built for one often struggle in the other. Knowing which mode you're in saves a lot of frustration. Trend following:
- Assumes price continues in its current direction
- Buys strength or pullbacks in uptrends, sells weakness or rallies in downtrends
- Wins big when trends are strong, but suffers whipsaws in ranges

Mean reversion:
- Assumes price returns toward an average after stretching
- Sells extremes in ranges, buys dips to the lower part
- Works well in sideways markets, but is dangerous in strong trends

How to identify the mode:

1. Look at structure. Clear higher highs and higher lows (or the reverse) suggest a trend.
2. Look at volatility. Expanding ranges often accompany trends.
3. Check moving averages. A slope with price staying on one side suggests trending conditions.
4. Check higher timeframes. A range on the 15M may be a pullback on the 4H.

How to apply:

- In trends, focus on pullback entries and trail stops with structure
- In ranges, trade the edges and target the middle or opposite edge
- When unsure, reduce size or wait

Mistake: using a trend-following strategy in a range, then switching to mean reversion during a trend, always one step behind.

Match your tool to the market, and your frustration will drop.

I switch mode with a simple morning measure rather than a gut call. If London ATR on my home pair sits under roughly 60 percent of its twenty day median, I lean mean reversion; if it sits above, I lean continuation after a clean break.

I disagree that one mode should own the whole session. A quiet Asia into a trending US open has flipped me mid morning more than once, and staying stubborn cost more than the switch.

The tell I watch is failed range edges. Three taps that refuse to break then snap back keep me in fade mode; a close outside with a retest flips me to follow for the next two hours.

I still size smaller for thirty minutes after a mode change. The first tickets in the new regime are the ones I used to force from habit.

How do you decide the flip when the morning was range and the afternoon starts printing higher highs? I want a rule you can point to on the card.

Knowing which mode the market is in is the hard part. One objective tool is the ADX: readings above 25 suggest a trend, below 20 suggest a range. Another is the Efficiency Ratio (Kaufman), net change over sum of absolute changes, which is a simple way to measure "trendiness".

Neither is perfect, but using one consistently is better than switching strategies on feeling.

FXS Prop Desk, I ran the Efficiency Ratio for a few weeks after your note. On 20 EURUSD M5 bars, readings above about 0.35 lined up with my trend days and readings under 0.2 with range days, which is close to your ADX split.

The band between 0.2 and 0.35 was the useful discovery. Neither mode did well there in my sample, so that band now means half size or no ticket at all.

ADX was harder to use for entries. A 14 period ADX on M5 tended to cross 25 roughly 40 to 60 minutes after the move began, so by then the best part of the trend was gone.

Where it helped was as a brake. When ADX rises through 25, I stop fading range edges, even if I am not ready to join the trend yet.

The always one step behind problem from the opening post is what this band fixes for me. I accept being late rather than wrong twice.

Which lookback do you use for the Efficiency Ratio on scalping timeframes, and does it change for the London open? Mine is fixed at 20 bars for now.