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How to Test EURGBP August Seasonality Without Cherry-Picking

Research protocol · Reviewed 24 Aug 2026

Calendar effects can be useful hypotheses, but five Augusts are still five calendar observations. A month can look distinctive because one year was extreme, because the chosen metric favoured it, or because twelve months were ranked after the fact.

This protocol treats seasonality as a distribution to estimate rather than a story about a supposedly patient or range-bound month.

Seasonality needs a denominator

FIELD 01

Test August against every other month, not against a memory

A five-year EURGBP sample contains only five August observations. Hundreds of hourly candles do not turn those five calendar blocks into hundreds of independent years. A credible seasonality study reports the number of years, the distribution within each month, and whether one unusual policy period dominates the average.

Define the behaviour being tested before opening the chart: range, directional return, realized volatility, breakout follow-through, or strategy expectancy. Comparing all twelve months creates a multiple-comparison problem, so an attractive August rank belongs in a later holdout period before it becomes a trading rule.

Independent unit

For calendar seasonality, the year-month block is usually more informative than the candle count. Serially related candles should not be presented as independent replications.

Regime control

Tag Brexit, ECB and Bank of England policy shifts, and abnormal volatility periods. Report whether the effect survives when the largest year is removed.

Cost question

A quieter month may reduce opportunity while leaving spread unchanged. Compare net expectancy and opportunity count, not smooth-looking price action alone.

  1. Freeze the month metric and session clock before calculating ranks.
  2. Show every annual August result rather than only the pooled mean.
  3. Correct for testing twelve months and several candidate rules.
  4. Reserve later years for confirmation without retuning the definition.

Seasonality is a weak prior until it repeats across independent calendar blocks and survives costs.

Choose one monthly behaviour first

Select a primary metric such as open-to-close return, high-low range, realized volatility, breakout continuation, or the net expectancy of one frozen strategy. Fix the data timezone and session before calculating all twelve months.

Measure uncertainty and concentration

Display each August separately, then compare its median, spread, and rank with the other months. Run a leave-one-year-out check: if removing one August changes the conclusion, the result is fragile. Account for the fact that several months and metrics may have been inspected.

Confirm on later calendar blocks

Write the proposed August rule once, then evaluate it on years not used to discover it. Report trade count, opportunity count, costs, and the weakest year beside the pooled result. A failed holdout is information, not a reason to redefine August.

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