New York Times

4:40 pm, 17 Oct 2008: Market Updates

4:40 pm : The week's wild ride has concluded, but onlookers might not know it by the relatively mild close had on Friday. The S&P 500 surged almost 12% Monday, suffered its biggest drop since the 1987 crash on Wednesday, and rallied more than 4% Thursday. On Friday alone the index swung nearly 7% from low to high before finishing with a 0.6% loss.

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Historical High-Low Volatility: Parkinson (2 years 20 weeks ago):

The  Parkinson formula for estimating the historical volatility of an underlying based on hi...

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