2-day RSI (14/10/90)
A very short-period oscillator captures the shortest-term excess: when price stretches to an extreme over two days, it snaps back. Entering on the close after the extreme and leaving one day later captures the give-back without staying exposed to whatever follows it — and the quick exit is the protection, because the indicator can sit at an extreme for a long time.
Measured in forex — EUR/USD and GBP/USD · daily bars built from 15m · 1 pip spread (~0.009% per round trip) · no survivorship bias
- ✓invariance
- ?costs
- ✗placebo
- ✗benchmark
- ?out of sample
- ?multiple testing
At its worst the account was worth 0% less than its own best previous moment, and it spent 2,158 days below that peak.
What was measured
How many of those trades actually count
What it paid, before any deductions
Why it did not pass — it died here · against randomly drawn dates
What would have happened to the money
What this result does NOT say
- One market, one universe
- Measured on 1 spot currency pair. It says nothing about futures, equities or indices, nor about how the same technique behaves in another market.
- One window of time, not every window
- The measured period runs from 2020-01-01 to 2026-06-26. A market moves through regimes, and a technique can work in one and fail in another — the card measures the regimes that fit inside this window, not the ones still to come.
- One cost structure
- The cost charged is a 1.0 pip spread, crossed once. Anyone paying more than that gets a worse result, and anyone paying less gets a better one — the verdict holds for this fee.
- One exit rule
- The trade was closed by: the technique itself (held until the opposite signal). The same entry measured with a different exit is a different strategy, and can earn a different verdict — it happens in this archive.
- The number of trades is not the sample size
- There are 2 trades, but only 2 independent market episodes: trades that overlap in time are not independent observations, and counting them as if they were inflates any result. It is the smaller number that governs the arithmetic. With 2 episodes, what the data supports is a range from -5.45% to +4.70% per trade — the published average is the centre of it, not the exact measurement.
- Daily bars
- Measured at the daily close. Nothing here measures what happens inside the day, and an intraday technique is not auditable with this data.
Numbers and reproducibility
The six controls
| control | status | t | threshold | episodes |
|---|---|---|---|---|
| invariance | passed | — | — | — |
| costs | inconclusive | -0.96 | 12.71 | 2 |
| placebo | failed | -0.95 | 12.71 | 2 |
| benchmark | failed | — | — | — |
| out of sample | inconclusive | — | — | — |
| multiple testing | inconclusive | — | — | — |
- invariance2 signals across 4055 bars
- costsgross -0.375% · cost 0.008% · net -0.384% (t=-0.96) · the range reaches +4.695%
- placeboactual -0.384% · placebo -0.002% · excess -0.382% ± 0.403% (t=-0.95 against a threshold of 12.71, 2 real groups, 100 sham dates, draw error ±0.054%)
- benchmarktechnique -0.38% · buy and hold (same horizon) -0.01% · excess -0.38%
- out of sampleasset half B: -0.384% (2 episodes — too small, does not count) · liquid half (>= US$ 0/day): -0.384% (2 episodes — too small, does not count)
- multiple testing1 variation(s) tested · t=-0.96 across 2 episodes (equivalent to t=-0.15) · p≈0.8821 · false positives expected by chance ≈ 0.88
Equity — outside the six controls, and here is why
The t of the trade series is invariant to bet size: 0.5%, 1% and 3% agree to the sixth decimal. Nothing here moves the verdict — it moves what the account would have lived through.
- risking 1.0% per trade
- ×1.00
- worst drawdown from the peak
- −0%
- days below the previous peak
- 2,158
- signals refused for lack of capital
- 0%
- paths where the account halved (out of 12)
- 0
Reproducibility
- period
- 2020-01-01 to 2026-06-26
- assets that traded
- 1
- variations tested before this one
- 1
- gross per trade
- −0.38%
- net per trade
- −0.38%
- exit rule
- the technique itself (held until the opposite signal)
- median duration bars
- 1
- mean duration bars
- 1.0
- max duration bars
- 1
- spread pips
- 1.0
- episode days
- 7
- seed
- 20260728
- 2-day RSI period
- 14
- 2-day RSI lag
- 2
- oversold
- 10.0
- overbought
- 90.0
Twelve Data forex (15m aggregated to 1d) · collected on 2026-07-25 · 2 assets · 4,055 bars · 2020-01-01 to 2026-06-26
Hypothesis, filed before the result
The RSI with the 1-day change replaced by the 2-day one. Thresholds 10 and 90, enters at the next close, exits a day later. Completely specified, exit included — rare in this corpus. And it is the card I most want to see: the SOURCE ITSELF publishes that its profitability INVERTED in 1998 ('from 1970 to 1998 it was a good trend indicator; since 1998 it has been much better as mean reversion'). A technique whose sign flipped in the middle of the sample, published as a favourite. Prediction: control 5 will find the decay, and the scaling table the source publishes alongside is an adjustment made after the result — it will not be audited. Family prediction, filed before measuring: (1) the control that kills the most will be COST, and not invariance — unlike the `adaptativos` family, because these are discrete-signal oscillators, they turn over less and are not always in the market; (2) the DIVERGENCE techniques will come out mostly INCONCLUSIVE, because they require two aligned peaks and fire rarely; (3) none survives the family's Benjamini-Hochberg. I record that prediction (1) is the opposite of the one I made in `adaptativos` and that was confirmed there — if I get it wrong again in the same direction, that is a sign I am misreading the mechanism of cost, not the technique. MEASURED IN FOREX (EUR/USD and GBP/USD, daily bars built from 15m), not in crypto. This is a pre-registered REPLICATION of the same technique in the second market — not a new discovery — and the multiple-testing count treats it as such. What changes relative to the crypto card: 2 pairs over 6.5 years against 540 over 9, a round trip costs about 20× less (a 1 pip spread crossed once, against 0.1% commission per leg), the detection floor is about 10× lower (0.092% against 0.97%) and there is NO survivorship bias, because a currency pair does not get delisted. And the family prediction that has ALREADY FAILED once in `adaptativos` is put on record: I wrote there that «cost cannot be the gravedigger» in forex, and it killed 6 of 10 — cost is 22× smaller, but gross return is 30× smaller. Here I expect the same mechanism, and this time that is the prediction.
filed on 2026-08-03, before the number existed
The original, as it was filed
RSI trocando a variação de 1 dia pela de 2. Limiares 10 e 90, entra no fechamento seguinte, sai um dia depois. Completamente especificado, saída inclusive — raro neste corpus. ⚠️ E é o card que eu mais quero ver: a PRÓPRIA FONTE publica que a lucratividade dele INVERTEU em 1998 ('de 1970 a 1998 foi um bom indicador de tendência; depois de 1998 tem sido muito melhor como reversão à média'). Uma técnica cujo sinal trocou no meio da amostra, publicada como favorita. Previsão: o controle 5 vai encontrar o decaimento, e a tabela de escalonamento que a fonte publica junto é ajuste posterior ao resultado — não será auditada. Previsão da família, registrada antes de medir: (1) o controle que mais mata será o CUSTO, e não o invariante — diferente da família `adaptativos`, porque estes são osciladores de sinal discreto, giram menos e não são sempre-no-mercado; (2) as técnicas de DIVERGÊNCIA sairão majoritariamente INCONCLUSIVAS, porque exigem dois picos alinhados e disparam pouco; (3) nenhuma sobrevive ao Benjamini-Hochberg da família. ⚠️ Registro que a previsão (1) é o oposto da que fiz em `adaptativos` e que se confirmou lá — se eu errar de novo na mesma direção, é sinal de que estou lendo mal o mecanismo do custo, e não a técnica. ⚠️ MEDIDO EM FOREX (EUR/USD e GBP/USD, diário agregado de 15m), e não em cripto. Isto é uma REPLICAÇÃO pré-registrada da mesma técnica no segundo mercado — não uma descoberta nova —, e a conta de múltiplos testes a trata como tal. O que muda em relação ao card de cripto: são 2 pares em 6,5 anos contra 540 em 9, o custo do giro é ~20× menor (spread de 1 pip cruzado uma vez, contra comissão de 0,1% por lado), o piso de detecção é ~10× menor (0,092% contra 0,97%) e NÃO há viés de sobrevivência, porque par de moeda não é deslistado. ⚠️ E fica registrada a previsão da família que JÁ FALHOU uma vez em `adaptativos`: escrevi lá que «o custo não tem como ser o coveiro» em forex, e ele matou 6 de 10 — o custo é 22× menor, mas o retorno bruto é 30× menor. Aqui espero o mesmo mecanismo, e desta vez a previsão é essa.
Quotations from the source were translated from the Portuguese record and back into English — they are not the author's exact words.
Pre-registration exists to keep prediction apart from rationalisation: written after the number, every hypothesis is right.