Donchian Channel

20 days represents approximately one trading month (4 weeks × 5 trading days). Richard Donchian originally developed this for commodities. The Turtle Traders validated it extensively. 20 days captures significant price moves while filtering day-to-day noise. Alternatives: 10-day for active trading, 55-day for longer-term.

No. Many breakouts fail, especially in ranging markets. Add filters: Only trade when ADX > 25 (trending), price above 50 EMA (for longs), volume > 1.5× average. Score each breakout and only take high-quality setups. This dramatically improves win rate.

Donchian uses highest high/lowest low (fixed lookback). Bollinger uses standard deviation from moving average (volatility-adaptive). Donchian is for breakout trading - enter when new highs/lows are made. Bollinger is often used for mean-reversion - fade moves to the bands. Different philosophies.

Three common options: 1) 10-day low (Turtle style) - trails as trade profits. 2) Middle line (average of bands) - moderate tightness. 3) 2× ATR below entry - volatility-adjusted. The 10-day low is most traditional and provides good trailing protection.

Donchian is a breakout system - many breakouts fail (false breakouts). This is normal. The system works because winning trades are MUCH larger than losing trades (often 3-5× larger). You need discipline to take the losses knowing that occasional big winners pay for them.

Use 20-day channel for entries (breakout above 20-day high = long). Use 10-day channel for exits (close below 10-day low = exit long). This gives wide entry filter and tight exit protection. The 10-day low trails up as price rises, protecting profits.

Generally, stick with 20-day for consistency. However, more volatile stocks might benefit from longer periods (25-30 days) to reduce whipsaws. Less volatile stocks might use shorter periods (15 days). Backtest any changes before live trading.

Gaps can trigger valid breakouts. If the gap is news-driven and sustained through the day, treat it as valid. If the gap fills quickly, it may be a false breakout. Wait for daily close to confirm. Consider volume - high volume gaps are more likely genuine.

Narrow channels (< 5% of price) indicate consolidation - breakouts often lead to strong moves. Wide channels (> 10%) indicate recent volatility - breakouts may be exhausted. Focus on narrow channel breakouts for better risk/reward.

Weekly channel for major trend, daily for entry. Only take daily breakouts in the direction of weekly channel. If weekly is bullish (price above weekly upper band or above weekly middle), take daily long breakouts. Skip counter-trend breakouts.

Require breakout to exceed band by minimum amount (e.g., 0.5× ATR). If upper band is $50 and ATR is $2, only enter on close above $51. This filters marginal breakouts. Also consider ATR trailing stop instead of 10-day low for exits.

Narrow channel = buy volatility (straddles, strangles) expecting expansion. Wide channel = sell premium (iron condors) expecting contraction. Breakout direction = call/put bias for directional spreads. Use breakout as entry trigger, 10-day exit as close trigger.

Score 0-10: Narrow width (<5%): +3. Volume > 2× average: +2. Above 50 EMA (longs): +2. ADX > 25: +2. Near 52-week high: +1. Enter highest-scoring breakouts first. Minimum threshold of 6-7 points. Track score vs outcome to refine.

Track by regime (trending vs ranging), channel width percentile, volume confirmation yes/no, exit method used. Key metrics: Win rate, profit factor, average winner/loser ratio, max consecutive losses. Most useful: Regime breakdown showing trending periods dominate profits.

Track rolling 2-3 year profit factor. If declining while markets have trended, edge may be fading. Also compare narrow channel breakout performance vs wide - if narrow is declining, the core edge may be weakening. Consider adding filters or adjusting parameters.