Encyclopedia of Chart Patterns. Thomas N. Bulkowski

it? So price fails to turn at the new target D and moves to G, peaking at 158.77, well above the 153.41 target. Shorting the stock at F would have tested a trader's courage against a rising price trend when the stock climbed to G.

      Look back at Figure 2.2 where it shows another example of how the pattern fails to see price decline much after D. Price drops from 67.36 (point D) to 65.22 (point E), a drop of 2.14 points or 3%. Could you make money shorting the stock at D, knowing that if you traded it perfectly, you'd make 3%?

      If you owned the stock (long) and sold at D thinking price would drop, you'd be happy that the stock dropped to E, but your joy would turn to sadness when the stock continued climbing up to F and beyond. It would say you'd made a mistake.

      Of course I chose Figure 2.3 to highlight the failure of this pattern to perform as expected. That's what the Focus on Failures section is supposed to do. In the next section, we'll see what the numbers say about how this pattern behaves.

Statistics

      Table 2.2 shows general statistics for the bearish AB=CD and tailored to the Fibonacci pattern. That means you won't find explanations for the table entries in the Glossary. Most are self‐explanatory.

      Number found. If you can program your computer to find them, you'll discover that they come out like worms after a heavy downpour. They were so plentiful that I limited the number catalogued per stock.

      I found the first pattern in February 1990 and the most recent in February 2020, finding them in 884 stocks. Not all stocks covered the entire period, and some stocks no longer trade.

Table 2.2 General Statistics

Description	Bull Market	Bear Market
Number found	2,649	696
Breakeven failure rate	26.3%	10.2%
Average decline after D	–12.7%	–21.6%
Volume trend	54% Downward	58% Downward
Performance Up/Down volume	–13%U, –13%D	–19%U, –24%D

Breakeven failure rate. For those patterns that see price make it up to D and reverse there, this is a measure of how often price fails to drop more 5% (below the high at D). The bull market value is high (ranking fourth out of five, where one has the lowest failure rate), but the bear market rate, at 10.2%, is the worst of the five bearish Fibonacci patterns I looked at.

      Average decline after D. This is a measure of the drop after point D, for those patterns seeing price make it up to point D and reverse there. As one would expect, the drop in bear markets is larger than in bull markets. If you were to trade the bearish AB=CD pattern perfectly and frequently, this is how much you could make on average. Commissions were not included.

      Volume trend. I used linear regression from the start to end of the pattern and found it trends downward most of the time, but it's near random.

      Performance Up/Down volume. I checked performance when volume was trending up or down. This applies only to those patterns that turned down at D. The bull market shows no performance difference, but in bear markets, the performance difference is wider and substantial. Patterns with downward‐sloping volume see price drop an average of 24% compared to a 19% decline for those with up‐sloping volume.

Trading Tactics

      The AB=CD pattern can be a wonderful tool to help predict when price will turn and then make a substantial decline. Once you know the first three turns, you can determine when and at what price the fourth turn will appear. And when turn D appears, the stock will drop. Does it really work like that? Let's find out.

      Table 2.3 shows how price behaves after point D.

      How often does price reach or exceed D? I checked how often price climbed far enough to reach the calculated price of D. The table shows that nearly all of the patterns reached the target turn.

Table 2.3 Price Move after Pattern End

Description	Bull Market	Bear Market
How often does price reach or exceed D?	95%	98%
How often does price turn at D?	32%	38%
How often does D appear within a week of calculated time?	43%	45%
How many drop to point A?	24%	36%
How many drop to point B?	76%	87%
How many drop to point C?	35%	46%

That's terrific! Swing traders can use this to predict how far price will rise. They can even trade it by buying at the low at C and riding price higher, to D.

      How often does price turn at D? I checked each pattern to see if a minor high formed at the calculated point D. I found that only about a third of the time will you see price turn lower at the calculated price of D. Because we know price rises to D nearly all of the time, we can assume that price continues beyond D instead of turning lower when it should.

      This finding is not a deal breaker. Now that we know price will likely continue rising, we can just stay in our trade (when we bought after turn C) and ride the stock upward until it does turn.

      How often does D appear within a week of calculated time? The pattern can work as a predictor of when point D will occur (as well as the price of the turn). I found the dates of the ABC turns and found the ratio of CB to BA. Then point D followed the equation: D = (C – B)/Ratio + C using dates instead of price.

      I found that between 43% and 45% of the time point D appeared within (plus or minus a 2‐week window) a week of when it was supposed to. Because the numbers fall well short of the expected time, I don't think this measure is helpful.

      How many drop to…? If price reaches D and turns down, we know that the average decline measures between 12% and 22% from Table 2.2. Let's measure how far price drops in terms of turns A, B, and C.

      Point B is closest to turn D, so we would expect the stock to drop that far most often. Indeed, the table shows that price reaches turn B between 76% and 87% of the time. Price will drop to C less often (35% to 46% of the time) and reach the bottom of the pattern (point A) even less often.

      Using these values, we can get a sense of how far price might decline. It could be less or more, depending on the situation, of course. But at least we have a roadmap.