Does a Volatile Day Follow a Volatile Day?
https://fxabsolute.com/stats/GBPUSD.json.
Across nine pairs
| Pair | Wide threshold | After a wide day | vs base rate | Samples |
|---|---|---|---|---|
| USD/JPY | 146.9 | 47.4% | +22.4 | 331 |
| EUR/JPY | 149.1 | 46.5% | +21.5 | 329 |
| GBP/JPY | 188.3 | 45.6% | +20.6 | 338 |
| EUR/GBP | 53.1 | 45.4% | +20.4 | 335 |
| USD/CAD | 97.7 | 44% | +19.0 | 339 |
| AUD/CAD | 75 | 42.7% | +17.7 | 330 |
| EUR/USD | 93.3 | 41.8% | +16.8 | 335 |
| AUD/USD | 79.6 | 40.7% | +15.7 | 334 |
| GBP/USD | 115.6 | 38.9% | +13.9 | 332 |
Every pair sits above 25%. That consistency is the finding — it is not one instrument's quirk, and it is the reason a fixed stop distance behaves differently depending on what yesterday did.
Why the base rate matters
"Thirty-nine percent of days after a wide day are also wide" sounds like an edge until you ask what share of all days are wide. It is 25%, because wide is defined as the top quarter. The finding is the 13.9-point difference, not the 38.9%.
Any statistic about market behaviour that arrives without its null is doing the same trick. It is worth asking for one every time.
What follows from it
A stop sized on a long-run average is too tight after a wide day and too loose after a quiet one, and the same is true of a target. That is an argument for sizing off recent range rather than a fixed number — not an argument for trading more after a busy day.
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Questions
Does forex volatility cluster?
Yes. Across all nine pairs measured, a top-quartile range day is more likely than chance to be followed by another — 38.9% against a 25% base rate on GBP/USD.
What counts as a volatile day here?
A day in the top quarter of that instrument's own daily range distribution. For GBP/USD that is 115.6 pips or more.
Is this a trading edge?
It is a sizing input, not a signal. It says the width of tomorrow is partly predictable; it says nothing about direction, which is the part that decides whether a trade makes money.
Beginner exploration
Three questions to help you use this page
Open each answer for a plain-language way to read Does a Volatile Day Follow a Volatile Day, test it carefully and decide what to explore next.
What does “Does a Volatile Day Follow a Volatile Day” mean for a beginner?
This page focuses on “Does a Volatile Day Follow a Volatile Day”.After a top-quartile day, 38.9% of GBP/USD days are also top-quartile — against a 25% base rate. Volatility clustering measured across nine FX pairs.For “Does a Volatile Day Follow a Volatile Day”, a beginner should identify what the evidence guide measures, assumes or teaches before acting on its conclusion.Treat this page's account of “Does a Volatile Day Follow a Volatile Day” as a learning reference rather than a prediction, signal or promise of future performance.
How should a beginner use this page to explore “Does a Volatile Day Follow a Volatile Day”?
For “Does a Volatile Day Follow a Volatile Day”, confirm the population, sample size, clock, units and calculation behind the headline number.While exploring “Does a Volatile Day Follow a Volatile Day”, compare the median, spread of outcomes and exceptions instead of reading only the average or best row.Keep your “Does a Volatile Day Follow a Volatile Day” record honest: use the statistic to frame a test or risk assumption, not to predict the next candle.Before leaving “Does a Volatile Day Follow a Volatile Day”, recheck the result on a separate period before turning a descriptive pattern into a rule.
How can AI help explore “Does a Volatile Day Follow a Volatile Day” responsibly?
Turn one idea from “Does a Volatile Day Follow a Volatile Day” into a rule with explicit inputs, dates, costs and pass-or-fail conditions.Ask AI to expose missing assumptions in that “Does a Volatile Day Follow a Volatile Day” test, not to guess the next market move.Use the FXAbsolute AI Backtesting Lab to inspect calculations connected to “Does a Volatile Day Follow a Volatile Day” and the assumptions behind them.Reproduce any important “Does a Volatile Day Follow a Volatile Day” result and reserve unseen data before deciding that an apparent pattern is useful.
Continue your exploration of Does a Volatile Day Follow a Volatile Day with the beginner AI prompt guide, or inspect public calculations in the AI Backtesting Lab.