Backtest evidence

Is a psychological line level of 75 the same as 75%, and does fading it work?

Is the Psychological Line 75% Rule Profitable? 5,760 Tests

Finding

The number typed in is not the percentage. The reading is a count out of N, so a 12-bar line takes only 13 values — 0, 8.3, 16.7 and so on — and asking for more than 75 asks for 10 bars out of 12, which is 83.3%. At period 12 anything from 75 to 83 gives the identical rule, while 74 gives 9 of 12, or 75.0%. Across periods 6, 10, 12, 14, 20 and 26, a typed 75 never meant 75%. The comparison operator changes the frequency fourfold: on 15-minute bars in 2025 a 12-bar line sat strictly above 75 on 1.76% of bars and at 75 or above on 7.02%, against 2.00% and 7.51% for a coin with the same up-bar rate. Mean reversion did win, but only in the flat year: on 15-minute bars 80 of 90 buy-the-lows settings finished 2025 ahead and kept +4.83 pips a trade after subtracting the year's drift, while the same calculation on 2024 gave −46.40 pips on four-hour bars, negative in 49 of 57 settings.

Key results

What a typed 75 actually requires at period 12
10 bars of 12, or 83.3%. Typing 74 gives 9 of 12, or 75.0%
Share of bars above 75 and at 75 or above
1.76% and 7.02% on 15-minute bars; a coin gives 2.00% and 7.51%
Reversal edge per trade after removing drift
+4.83 pips on 15-minute bars in 2025, −46.40 pips on four-hour in 2024

Scope

  • USDJPY, 2025-01-01 to 2025-12-31, with 2024 run identically for comparison
  • 15-minute, hourly and four-hour bars
  • 3 readings x 6 periods (6 to 26) x levels (fade: 5 entries x 3 exits; break: 5; midline: 5) = 240 per cell per up-bar definition; 3 timeframes x 4 windows = 5,760 runs
  • 0.3 pip spread fixed, 0.1 lots, filled at the close

Method

Measured with Formiq's backtester across three readings — fade, band break and midline cross — exiting on the opposite signal, with the fade carrying its own exit level. Both up-bar definitions were run. The drift is removed by subtracting what an unconditional position of the same length would have earned from the year's move.

Limitations

  • One pair, two years. The psychological line came out of equity markets, and a different instrument's bar-size distribution changes which rungs appear at all.
  • 2024 rose 1,632 pips and 2025 fell 56. The reversal share was positive only in 2025.
  • Many fade settings barely trade — about 25 a year on hourly bars and about 10 on four-hour. Some show a 100% win rate off five trades, and 48 to 74 of 180 settings fired fewer than five times.
  • The spread is fixed at 0.3 pips. The hourly midline breaks even at 0.98, so that assumption is doing real work.
  • Exits are on the opposite signal. A 30-pip stop with a 90-pip target helped in both years; nothing else did.
  • The two up-bar definitions could not be separated on results: 47.1% against 52.9% across 2,134 settings.