# Double Bottom/Top Trading Strategy
**Moeilijkheid:** intermediate · **Timeframe:** Weeks to months · **Asset:** stocks
**Strategie van:** William O'Neil
**Risk/Reward:** Low risk (tight stops), high reward (measured move)
**Win rate:** 78%

## Samenvatting
Trade 'W' en 'M' patronen die trendomkeringen signaleren. Één van de hoogste waarschijnlijkheid chartpatronen.

Double Bottom (W patroon) en Double Top (M patroon) zijn krachtige reversal signalen. Double Bottom vormt na dalende trend: prijs maakt low, stuitert terug, hertest zelfde low (binnen 3-5%), breekt dan boven weerstand. William O'Neil's onderzoek toont dat double bottoms met 'handvat' (kop-en-schotelpatroon variant) 95% succesrate hebben.

## Kernprincipes
- Two lows at roughly same level (within 3-5%)
- Minimum 4 weeks between lows, maximum 12 weeks
- Volume decreases on second low (selling exhaustion)
- Volume increases sharply on breakout above resistance

## Instap-regels
- Identify two clear lows at same price level
- Second low on lower volume than first (bullish)
- Enter on break above resistance between the lows
- Volume must be 50%+ above average on breakout

## Uitstap-regels
- Target = Depth of pattern + breakout price
- Stop loss below second low (2-3%)
- Take partial profit at 20-25%
- Trail remainder with 50-day MA

## Risico's
- Stop loss 7-8% below entry
- Position size based on stop distance
- Confirm with volume (crucial)
- Wait for complete pattern (don't anticipate)

## The Psychology Behind Double Bottoms: Capitulation, Retest, and Reversal
The double bottom pattern isn't just lines on a chart—it tells a story of market psychology. Understanding this psychology helps you identify genuine patterns versus false signals.

Phase 1: Capitulation. After an extended downtrend, fear reaches its peak. The first low forms as remaining bulls finally surrender and sell. Volume spikes as panic selling climaxes. This is the 'blood in the streets' moment—maximum pessimism, maximum fear.

Phase 2: Relief Rally. Price bounces as selling pressure temporarily exhausts. However, this rally fails at resistance (the 'neckline') because skeptical sellers and new shorts enter. Price rolls over.

Phase 3: Retest. Price falls again, testing the previous low. Crucially, this decline occurs on lower volume—selling is exhausted. Those who wanted to sell already sold at the first low. The retest either matches the first low or undercuts it slightly (within 3-5%).

Phase 4: Reversal. When price bounces from the second low and breaks above the neckline resistance with strong volume, the psychology shifts. Shorts cover, sidelined buyers enter, and a new uptrend begins.

## Double Top: The Distribution Pattern
The double top is the mirror image of the double bottom—a bearish reversal pattern that forms after extended uptrends. While the double bottom represents accumulation by smart money, the double top represents distribution.

In a double top, price makes a high, pulls back to support (the neckline), rallies again to approximately the same high, then fails. This second rally represents the 'last gasp' of the uptrend—buyers push hard but can't break through. The pattern resembles the letter 'M' on the chart.

The psychology reveals distribution: at the first peak, smart money begins selling to retail buyers excited by new highs. Price pulls back but rallies again as retail buying continues. At the second peak, institutions complete their distribution—there are simply not enough new buyers to push prices higher. When price breaks below the neckline support, the distribution is confirmed and price cascades lower.

William O'Neil noted that double tops are slightly less reliable than double bottoms (73% vs 78% success rate) because selling can be more gradual than panic buying. Always wait for neckline confirmation before entering short positions.

## The Neckline: Critical Confirmation Level
The neckline is arguably the most important element of double bottom and double top patterns. It's the confirmation level that separates a potential pattern from a confirmed reversal.

In double bottoms, the neckline is the resistance level connecting the peak(s) between the two lows. Price must close above this level with conviction for the pattern to be confirmed. In double tops, the neckline is support—the low point between the two peaks.

Critical rules for neckline trading: Never trade before the neckline breaks. Many patterns fail when price reverses at the neckline rather than breaking through. Volume must confirm—breakouts should occur on at least 50% higher volume than the 20-day average. The 'retest' provides a second entry opportunity—price often returns to 'kiss' the neckline (now support in double bottoms, resistance in double tops) before continuing in the breakout direction.

The measured move target uses the neckline: measure the depth from the lows to the neckline, then project that same distance above the neckline for your price target. This technique works because markets tend to 'remember' the distance they traveled and replicate it after breakouts.

## Timing and RSI Divergence: Enhancing Pattern Reliability
Two factors dramatically increase double bottom success rates: proper timing between lows and RSI divergence confirmation.

Timing matters significantly. O'Neil's research shows patterns with 4-12 weeks between lows have the highest success rates (78%). Patterns with less than 4 weeks may simply be normal volatility rather than genuine reversals. Patterns with more than 12 weeks lose their psychological cohesion—market conditions may have fundamentally changed.

RSI divergence provides powerful confirmation. At the first low, RSI might read 25 (deeply oversold). If price retests that low but RSI reads 35 (higher low), you have bullish divergence—momentum is improving even though price is flat. This divergence signals that selling pressure is truly exhausted.

The combination is most powerful: a double bottom with 6-8 weeks between lows, declining volume on the second low, clear bullish RSI divergence, and a neckline break on above-average volume. William O'Neil called this setup 'near-perfect' and reported 85%+ success rates when all conditions aligned. Skip patterns that lack these confirmations—discipline in pattern selection is what separates profitable traders from the crowd.

Bron: https://daytraders.nl/strategies/double-bottom-top-trading-strategy