40 day SP500 price range forecast by Investolution

It is predicted that S&P 500 Index will not close under 1,245 and over 1,323 between the dates August 27, 2008 and October 22, 2008. This prediction method was accurate for 70.0% and 95.0% of the cases (for minimum and maximum predictions, respectively) within an error margin of +-5% in the past.