How Often Does the Market Actually Trend?
https://fxabsolute.com/stats/GBPUSD.json.
Across nine pairs
| Pair | Median efficiency | Trend days | Chop days |
|---|---|---|---|
| USD/JPY | 0.48 | 35.5% | 29.8% |
| EUR/JPY | 0.47 | 34.1% | 30.1% |
| EUR/USD | 0.46 | 34% | 30.1% |
| AUD/USD | 0.47 | 33.7% | 31.1% |
| GBP/USD | 0.46 | 33.1% | 29.9% |
| USD/CAD | 0.45 | 32.4% | 33.6% |
| GBP/JPY | 0.45 | 31.7% | 32.3% |
| AUD/CAD | 0.45 | 31.5% | 31.4% |
| EUR/GBP | 0.43 | 29.2% | 34.4% |
The spread between instruments is narrow. Roughly a third of days trend cleanly, roughly a third chop, and the rest sit between — on every pair measured.
Why this decides which strategy is being tested
A trend-following rule earns its money on the 33.1% and pays it back on the 29.9%. A mean-reversion rule does the reverse. Neither is right in general, and a backtest that happens to cover a stretch unusually rich in one kind of day will report an edge that belongs to the period rather than the rule.
The practical use is as a sanity check on a result. If a trend strategy shows a high win rate over a sample, it is worth knowing whether that sample had more than its share of the third of days where trend rules work.
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Questions
How often does forex trend?
About a third of days. On GBP/USD, 33.1% of days convert 60% or more of their range into net movement; 29.9% convert 30% or less.
What is directional efficiency?
The absolute distance from open to close divided by the day's high-to-low range. A clean one-way day approaches 1; a day that returns to its open having covered its range approaches 0.
Which pair trends most cleanly?
Of those measured, USD/JPY — 35.5% trend days against EUR/GBP's 29.2%. The differences are small.