Over the last two days the S&P 500 has gained a staggering 4.48%. That’s more than half of the return one might expect in an average year…in only two days! To put that into perspective, the chart below shows the two-day percentage change in the S&P 500 with plus and minus three standard deviations overlaid. That is three standard deviations, not two which is a rare occurrence in itself. The probability of a normally distributed series coming in more than three standard deviations above the mean is .0015% or a 1 in 666 chance.
Jeremy Jones, CFA, CFP® is the Director of Research at Young Research & Publishing Inc., and the Chief Investment Officer at Richard C. Young & Co., Ltd. Richard C. Young & Co., Ltd. was ranked #10 in CNBC's 2019 Financial Advisor Top 100. Jeremy is also a contributing editor of youngresearch.com.
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