Tuesday, July 20, 2010 11:49:00 PM
Sigma Channels
"In statistics, Sigma means standard deviation from a mean. In trading, when we say "XYZ is at +2 Sigma," it means XYZ is trading at 2 standard deviation above its mean, hereinafter its 20 day moving average (i.e., it is at Upper Bollinger Band). As avid students of volatility, we monitor prices using +3, +2, +1, -1, -2 and -3 Sigma Channels. This method tells us how "stretched" the prices are..."...Hamzei
All posts are imho only. Do not buy or sell securities based on my opinions.
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