Yes, you can make money trading Bollinger Bands, but the instrument must have a minimum volatility percentage of 4%. Here are the rules, using a length of 20 and 2 standard deviations.
1. Calculate the daily Average True Range (ATR) of the instrument.
2. Calculate the upper Bollinger Band (SD = 2).
3. Calculate the lower Bollinger Band (SD = -2).
4. Calculate the difference between the upper and lower bands (I think Bollinger calls it bandwidth).
5. Calculate the band ratio, i.e., divide the bandwidth by the ATR. This band ratio must be less than a certain percentage of the ATR, e.g., 0.2 or 0.3. This is Condition 1.
6. Calculate the range ratio, i.e., divide the bandwidth divided by the average bandwidth for the past 20 bars. This range ratio must be a low percentage, e.g., 0.3. This is Condition 2.
7. If Condition1 and Condition 2 are satisfied, then buy a certain number of ticks above the upper BB. Short a certain number of ticks below the lower BB.
8. Exit the position at the close of the day, or whichever profit target / stop strategy you use.
9. Don't trade on Friday afternoons, unless it's a newsworthy day.
In general, the system trades between 5 and 10 times per month, assuming the minimum volatility requirement is met. I focus on stocks that trade an average volume at least 2 million shares per day over the reference period. Sample performance report for QQQ on a 10-minute chart follows:
TradeStation Strategy Performance Report - BB QQQ-10 min (11/13/2000-10/18/2002)
Performance Summary: All Trades
Total Net Profit $235,810.00
Open position P/L $0.00
Gross Profit $391,770.00
Gross Loss ($155,960.00)
Total # of trades 146
Percent profitable 61.64%
Number winning trades 90
Number losing trades 56
Largest winning trade $15,070.00
Largest losing trade ($6,480.00)
Average winning trade $4,353.00
Average losing trade ($2,785.00)
Ratio avg win/avg loss 1.56
Avg trade (win & loss) $1,615.14
Max consec. Winners 12
Max consec. losers 4
Avg # bars in winners 10
Avg # bars in losers 9
Max intraday drawdown ($18,470.00)
Profit Factor 2.51
Max # contracts held 21,000
Account size required $18,470.00
Return on account 1276.72%