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Somewhere around page 168 of Japanese Candlestick Charting Techniques, Steve Nison writes the most honest sentence in technical analysis:
“There are no concrete rules.”
He’s talking about his own method. He has just spent nine chapters teaching hammers, harami, engulfing patterns, dark-cloud covers, tweezers, three Buddha tops, and the abandoned baby. Then he tells you that two competent readers looking at the same chart will not see the same patterns.
He’s right, and I respect him for saying it. This is a review of what happens when you try to test a method whose author has told you, in advance, that it has no rules.
(Previously: One Look at Ichimoku, where the cloud turned out to be Saturdays.)
1. What the book is#
Nison’s 1991 book introduced candlestick charting to Western markets and succeeded so completely that candlesticks are now the default rendering on essentially every exchange on earth. It has two halves.
The vocabulary. Around forty named patterns built from four numbers per session:
$$\text{real body} = |C - O| \qquad \text{upper shadow} = H - \max(O,C) \qquad \text{lower shadow} = \min(O,C) - L$$White body if the close beat the open, black if it didn’t. Every pattern in the book is a boolean expression over those quantities and their lags — genuinely elegant, and far more compact than the prose suggests. Nison never writes them as formulas, so I did. A hammer:
$$(\min(O,C) - L) \geq 2|C-O| \quad\wedge\quad (H - \max(O,C)) \approx 0$$Here’s the thing worth noticing immediately. A hammer and a hanging man are the same line. Identical geometry. One appears in a downtrend and is bullish; the other appears in an uptrend and is bearish.
So the shape carries no information. The context assigns all of it. Which raises the obvious question — how does Nison define “downtrend”?
He doesn’t. Not in 316 pages. Hold onto that; it becomes the whole story.
The doctrine. Part 2 is built on the Rule of Multiple Technical Techniques: “the more technical indicators that assemble at the same price area, the greater the chance of an accurate forecast.” Or as his DISCIPLINE mnemonic puts it: “Indicators — the more the better.”
What I did: formalised eight patterns, found every occurrence in six years of daily Bitcoin (2014–2019, holdout sealed), and measured what happened next.
2. What’s good about it#
I want to be fair here, because the book is better than its reputation among quants.
The visual encoding is a real contribution. Candlesticks compress open-versus-close into a single pre-attentive cue — filled or hollow — that a bar chart buries in two small ticks. Universal adoption isn’t an accident or marketing. It’s good information design.
Nison is honest about the limits in a way almost no technical author is. Most write with false precision. He does the opposite, repeatedly:
“As with all charting methods, candlestick chart patterns are subject to the interpretation of the user. This could be viewed as a limitation.”
He debunks his own category. On reversal patterns:
“the term ‘reversal pattern’ is somewhat of a misnomer… This rarely happens. Trend reversals usually occur slowly, in stages.”
That’s correct, and it contradicts how candlesticks are almost universally taught today.
The risk-management material is the best part of the book, and it’s right independent of whether any pattern works:
“A stop should be placed at the time of the original trade; this is when one is most objective.”
He insists on waiting for confirmation before acting on a signal — advice that reduces turnover and cost regardless of the patterns’ merit.
The scholarship is careful. Japanese terminology and provenance are preserved rather than flattened — yorikiri for the belt-hold, sumo metaphor intact. As translation and transmission, the book is excellent, and that was the actual assignment in 1991.
3. Where it fails#
Zero statistics in 316 pages#
I ingested the whole book and queried it specifically for success rates, sample sizes, hypothesis tests, backtests. What comes back is Fibonacci retracement tables and the formula for stochastic %K.
There is no $n$. There is no $p$. There is not one frequency count in the entire book.
Every piece of evidence is a chart exhibit — a hand-picked window where the pattern did what the caption says. Hundreds of them, each genuinely showing what it claims. But selecting confirming examples is a procedure that cannot produce a negative result, which is why it carries no evidential weight. Grimes made this concrete by drawing support and resistance lines at random with the price bars hidden — the exhibits look just as convincing.
The patterns add nothing — and here’s where I had to correct myself#
My first pass compared each pattern’s forward 5-bar return to the average across all bars. Six of seven underperformed, and the hammer — Nison’s flagship bullish reversal — came in at −2.96% versus baseline with a confidence interval excluding zero. A headline result: the hammer points the wrong way.
That result was confounded, and the confound is instructive.
A hammer only fires in a downtrend. And being in a downtrend is itself predictive:
| forward 5-bar return | |
|---|---|
| all bars | +0.870% |
| downtrend bars | +0.089% |
| uptrend bars | +1.565% |
The regime alone explains a 1.48 percentage-point gap. So any pattern that only fires in downtrends inherits that penalty for free, before its shape contributes anything at all.
The honest comparison is against other bars in the same regime:
| pattern | n | vs ALL bars (naive) | vs SAME regime | 95% CI |
|---|---|---|---|---|
| bullish engulfing | 49 | −0.45% | +0.35% | [−1.80, +2.59] |
| bearish engulfing | 36 | −0.28% | −1.01% | [−3.90, +2.04] |
| hammer | 37 | −2.96% (looked significant) | −2.26% | [−5.36, +0.68] |
| hanging man | 25 | −1.22% | −1.96% | [−6.90, +2.84] |
| shooting star | 29 | +0.90% | +0.21% | [−2.61, +2.99] |
Every interval now spans zero. The hammer’s apparent signal was mostly the trend filter, not the candle.
So the corrected finding is cleaner and more interesting than the one I started with: the candlestick shape adds nothing detectable once you know the trend. Whatever predictive content exists lives entirely in the trend context — which Nison requires on every page and defines on none.
That should sound familiar. It’s the same verdict the Ichimoku review reached: the regime filter survives, the ornate vocabulary layered on top does not.
The result survives changing my arbitrary choice#
Since Nison defines no trend, any test has to invent one — so I swept seven definitions (moving averages of 5/10/20/50, 5- and 20-bar returns, and no filter at all). Across 43 testable cells, 32 (74%) underperform the unconditional baseline, and the hammer is negative under all seven, growing more negative with longer windows.
The direction of the finding doesn’t depend on my choice. But that parameter remains a free variable in every candlestick study ever published, this one included. At least here it’s written down.
Some patterns barely happen#
Piercing appeared 4 times in six years. Dark cloud cover, 5. Patterns with pages of exposition are essentially absent from the data — untestable at nearly every trend definition.
Unfalsifiability, reframed as a virtue#
Having admitted the subjectivity above, Nison writes:
“In this sense, subjectivity may not be a liability.”
There’s the move. The limitation is promoted to a feature by assertion, in one clause, with no argument.
But a method with no concrete rules cannot be wrong. If the hammer works, the pattern was valid. If it fails, you misjudged the trend, or it wasn’t a true hammer, or you needed confirmation. Every outcome is absorbed. And a method that can’t be wrong can’t be shown right either. Unfalsifiability buys immunity from criticism at exactly the price of any evidence in your favour.
That’s what I mean by simulacra. Not that candlesticks are fake — that the system is built so “does this work?” has no answer, and the absence gets sold as flexibility.
“The more indicators the better” is backwards#
Candlesticks, RSI, stochastics, trendlines, retracements — every one is a deterministic function of the same OHLC series. When four of them “confirm” each other you haven’t gathered four witnesses. You’ve asked one witness four times and written down four answers.
The Ichimoku review already contains the proof: Senkou Span A isn’t an independent line, it’s algebraically $(\text{Tenkan}+\text{Kijun})/2$, measured residual 0.0000000000. Exactly zero independent information.
Confluence among correlated indicators is double-counting, not confirmation — and each indicator you add multiplies the space you can search, so the doctrine doubles as a recipe for finding patterns in noise. Two books, two authors, thirty years apart, same error.
The method is venue-dependent, and nobody says so#
Candlestick semantics rest on the open. Ichimoku never uses it — Muranaka’s sidebar is explicit: “Open is not used.”
So what is the open in a market that never closes?
| quantity | value |
|---|---|
| median $\lvert O_t - C_{t-1}\rvert / C_{t-1}$ | 0.048% |
| median $\lvert C_t - O_t\rvert / O_t$ | 1.458% |
| ratio | 0.033 |
The overnight “gap” in Bitcoin is about 3% of a typical day’s move. The open isn’t a price discovered by an auction after fifteen hours of accumulated news — it’s the last tick before midnight UTC, an arbitrary timestamp on a continuous tape. The real body is approximately just the daily return.
Nison’s window chapter fares worse. A window requires session ranges that don’t overlap at all. In six years of Bitcoin: 13 windows out of 2,190 bars — 0.59%. And those aren’t gaps; a 24/7 market has no break to gap across. An entire chapter has no referent here.
There’s a nice irony. Ichimoku is the older, stranger, more mystical-looking system, and it ports to crypto cleanly because Hosoda happened to build it from highs and lows. Candlesticks look more fundamental — they’re what every exchange draws by default — and they’re the ones the venue quietly breaks.
4. Where this goes next#
The strongest next test is the one that can prove me wrong.
The section above argues candlesticks fail in crypto because the open is degenerate. That’s a falsifiable structural claim, and the way to test it is to run the identical harness on an asset with a real session open — SPY, or a liquid futures contract with a genuine overnight break.
- If the patterns show an edge there but not in crypto, the venue hypothesis is supported.
- If they fail there too, my crypto explanation is superfluous — the patterns just don’t work, and the whole “open is degenerate” argument is a nice story that explains nothing.
That’s the cheapest available experiment that can falsify my own conclusion, which is why it goes first.
After that, in order:
- Cross-asset pooling. Sample sizes here run 25–96 per pattern, and 4–5 for the rare ones. Pooling across many liquid instruments would put these tests in a defensible range for the first time.
- Test the Rule of Multiple Technical Techniques directly. Nison’s central doctrine is an empirical claim — does stacking correlated indicators improve accuracy or degrade it? Measure agreement-count against forward return. Two books now assert it. Nobody has measured it.
- Go intraday. If the open is the problem, then 4-hour and 1-hour candles have no meaningful open at all, and the degeneracy should get measurably worse. That’s a clean directional prediction — and it happens to be where most retail candlestick content lives.
- The outstanding Ichimoku holdout. The pre-registered 10/30/60 specification is still unrun, along with the question upstream of it: has Bitcoin’s fat right tail compressed since 2020?
And the next system to review: Murphy’s core Western apparatus — trendlines, support and resistance, head-and-shoulders. Both reviews so far have landed in the same place: the regime does the work, and the vocabulary on top contributes nothing measurable. Murphy’s chart patterns are the largest remaining body of claims that has never faced that control.
Full report with formalised pattern definitions and complete measurements: PDF · Markdown
In-sample only, 2014–2019; the 2020+ holdout is unopened. Not investment advice.