Image via Wikipedia Risks are magnified after a historically volatile event like Thursday. The 11.3% intraday move was a 10 sigma event (if you treat the daily range of SPY as a normal Gaussian distribution). Per the excellent blog at http://www.aleph.se/andart/archives/2009/09/ten_sigma_numerics_and_finance.html, a 10 sigma event can be expected to occur in 1x 10^23 days or […]
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