Bollinger Bands - Technical Indicators 

Bollinger Bands use standard deviation as a measure of stock price historical volatility to compare stock price movements to the moving average levels. Bollinger Bands usually consist of upper and lower bands and may include a moving average as a reference. Bollinger Bands were developed by John Bollinger. 
 

There are several observations that help you to interpret Bollinger Bands: 
stock prices tend to stay within the upper and lower band; sharp price changes tend to occur after the bands tighten; when prices move outside the bands, a continuation of the current trend will continue; bottoms and tops made outside the bands are usually followed by bottoms and tops made inside the bands; a stock price move that originates at one band tends to go all the way to the other band.

Bollinger Bands are calculated using the following formulas:

where D is standard deviation which is usually equal to 2 and n - moving averages periods which is usually equal to 20. MA is a simple moving average calculated as

STFC SBIB SUSQ TROW TRBS TGIC TCNJ TRST TRMK UCBH UMBF UMPQ UBSI  

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