SPX Bollinger Band Historical Extreme

SP:SPX   标准普尔500指数
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The recent drop from the SPX             has proven abrupt, but it may be historically so. Using a weekly chart and Bollinger Bands - standard 20-period MA and 2 standard deviation settings - we find price marked its biggest downside move beyond the lower bounds of 2 standard deviations on records I have going back 30 years. I don't consider this a buy signal though given the extreme one-sided activity of the past six years.
I agree that whats going on now is remarkable historically - however on my monitor there is no need to look at 30 years of history

price is likely to retest 10-year trend at ~ 1838 - measured by bollingers (520 weeks, 1.25 st deviations) - first time since 2013

the 5-year trend already sort of failed, however it needs some time to recharge - after 5 years of trending=)

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