ARTICLE SYNOPSIS...INDICATORS AND FORMULAS Bollinger bands are channel lines plotted two standard deviations above and below a 20-day simple moving average. A 20-day lookback period is also used for the standard deviation measurement. The formula for standard deviations i
ARTICLE SYNOPSIS...OBSERVATIONS AND FORMULAS To devise a technical indicator out of all this, consider first Article Figure 3. Today's low (Day 1 low) is 250 points below the high of Day 4 and 300 points below the high of Day 9. To which high is today's low most overexten