English to Portuguese Bus/Financial Finance (general) análise técnica dos mer

The first requirement in plotting a Bollinger band is a time span, as with a moving average. The first requirement in plotting a Bollinger band is a time span, as with a moving average. The longer the span, the smoother, but less sensitive, are the fluctuations. The plot in the upper window shows one of 10 days and the lower one a smoothing of 40 days.