Bollinger Bands are a tool of technical analysis which was invented by John Bollinger in the 1980s. Having evolved from the concept of trading bands, Bollinger Bands are an indicator that allows users to compare volatility and relative price levels over a period time. Basically, this tool provides a relative definition of high and low. By definition prices are high at the upper band and low at the lower band. This definition can aid in rigorous pattern recognition and is useful in comparing price action to the action of indicators to arrive at systematic trading decisions. When the market is calm, the Bollinger Band lines get closer together and when the market was changing Bollinger Band line expand.
Sorry I didn’t mean to come off that way, I am recovering from a flu, so forgive my rudeness.
John stated it himself in an interview that he doesn’t use Bollinger Bands. I thought this was pretty known personally. Doesn’t mean they don’t work or aren’t worth using, so I apologize if I came off that way.
I’ve never tried them within a trading plan that works. To me they just clutter my chart and confuse me.
If they work for you then awesome. I’ll check your link.