Bollinger Bands consist of:
* a middle band being a N-period simple moving average
* an upper band at K times a N-period standard deviation above the middle band
* a lower band at K times a N-period standard deviation below the middle band
Typical values for N and K are 20 and 2, respectively.
When the bands lie close together a period of low volatility in stock price is indicated. When they are far apart a period of high volatility in price is indicated. When the bands have only a slight slope and lie approximately parallel for an extended time the price of a stock will be found to oscillate up and down between the bands as though in a channel.
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