There are lots of Technical Analysis sites around but this one explains things a little, and makes a pretty good chart, including Bollinger bands. iqc.com
They were created by John Bollinger, I think, who still is active on some web site or other from what I hear. Seems to me it is a high and low band, each about 2 standard deviations from the moving average? Anyone correct me if wrong.
Rarely do stocks bust through the high band or low band into open territory. If they ever do, they often spring back inside or push the band outward at a steep angle. Also, (take a look at some of your favourite charts) whenever the price moves across the centerline and far enough into the other side, it usually sucks up to the opposite band. If it crosses the centerline indecisively it's hard to say - may shoot back to same side or opposite side.
It's just another indicator, but for me I would stay away from a stock that is pushing down to the bottom of the low side for a month or two. Take a look at TMAR chart. |
