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Putting Recent Market Volatility In Context

  • Written by Syndicated Publisher No Comments Comments
    February 5, 2016

    The increase in market volatility has been a major focus of the popular financial press during the opening weeks of 2016. Let’s examine the historical context for market volatility over the past nine-plus years, specifically since January 2007. Our preferred measure of volatility is the daily price range in the S&P 500: The percent change from the intraday low to the intraday high. To illustrate this bit of market behavior, we’ve charted the intraday range, the red dots in the accompanying chart, along with a 20-day moving average of this measure. To assist us in viewing the correlation with the market, we’ve overlaid an area chart of the index itself.

    S&P 500 MAs

    The intraday percent change across the entire timeframe ranges from a low of 0.20% to a high of 11.52%. The average for the 2288 market days charted above is 1.45%.

    Since the recovery after the 2009 market low, we saw interim peaks in May of 2010, which preceded the -15.99% correction trough a few weeks later on July 2nd. A higher interim volatility peak occurred in late August of 2011, which preceded a more severe -19.39% correction trough on October 3rd of that year.

    At present, the 20-day moving average of the percent change is 2.20%, matching a level in mid-September of last year. This measure of volatility is about where we were August 2007 during the decline between the twin peaks in the S&P 500 preceding the bear market that bottomed at -56.78% at the close on March 9, 2009.

    For a better sense of volatility surrounding that 2009 low, here is a snapshot of the data for the calendar years 2008 and 2009.

    S&P 500 MAs

    We see that intraday price volatility peaked a bit over four months before the market bottomed. We can also see a much smaller increase in our volatility moving average in the days following the bottom, reflecting no doubt the mixed views about whether the bottom was in.

    To reiterate, the latest 20-day moving average of the percent change is 2.20%, about where we were August 2007 during the decline between the twin peaks in the S&P 500 before the savage bear market that followed. The question, of course, is … Will a further increase in volatility will be correlated with a deeper correction? Or is the worst behind us?

    We’ll update these charts periodically in the weeks ahead.


    Note: For the curious observer, in the first chart above we included a callout for the Flash Crash on May 6th 2010, when the intraday range for the S&P 500 was a stunning 9.55%, and the index plunged 3.24%.

    Images: Flickr (licence attribution)

    About The Author

    My original dshort.com website was launched in February 2005 using a domain name based on my real name, Doug Short. I’m a formerly retired first wave boomer with a Ph.D. in English from Duke. Now my website has been acquired byAdvisor Perspectives, where I have been appointed the Vice President of Research.

    My first career was a faculty position at North Carolina State University, where I achieved the rank of Full Professor in 1983. During the early ’80s I got hooked on academic uses of microcomputers for research and instruction. In 1983, I co-directed the Sixth International Conference on Computers and the Humanities. An IBM executive who attended the conference made me a job offer I couldn’t refuse.

    Thus began my new career as a Higher Education Consultant for IBM — an ambassador for Information Technology to major universities around the country. After 12 years with Big Blue, I grew tired of the constant travel and left for a series of IT management positions in the Research Triangle area of North Carolina. I concluded my IT career managing the group responsible for email and research databases at GlaxoSmithKline until my retirement in 2006.

    Contrary to what many visitors assume based on my last name, I’m not a bearish short seller. It’s true that some of my content has been a bit pessimistic in recent years. But I believe this is a result of economic realities and not a personal bias. For the record, my efforts to educate others about bear markets date from November 2007, as this Motley Fool article attests.
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