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The author writes that the Trinity Study was updated in 2009 (it was updated in 2011 using data through 2009), says he conducted his own "research" over a 23 year period covering the years 1988-2011 (that's 24 years, from Jan 1 1988 to Dec 31 2011), and uses a single 23 24 year period (a curiously odd number) rather than rolling 30 year periods as Trinity did.
If one is going to use a single time period, then instead of his choice of 1988-2011, one might look at 1973-2002 (a true 30 year period). Eyeballing suggests this is the worst postwar 30 year span - starting with the dreadful 1973-1974 bear market (-48%), 1980-82, 1987 (a quick 3 mo. loss of 33.5%), and ending with the 2000-2002 loss of 49.1%.
(I really don't know how bad this would come out; it is left as an exercise for the reader.)
Comments
2324 year period (a curiously odd number) rather than rolling 30 year periods as Trinity did.If one is going to use a single time period, then instead of his choice of 1988-2011, one might look at 1973-2002 (a true 30 year period). Eyeballing suggests this is the worst postwar 30 year span - starting with the dreadful 1973-1974 bear market (-48%), 1980-82, 1987 (a quick 3 mo. loss of 33.5%), and ending with the 2000-2002 loss of 49.1%.
(I really don't know how bad this would come out; it is left as an exercise for the reader.)
Bear market data: http://www.nbcnews.com/id/37740147/ns/business-stocks_and_economy/t/historic-bear-markets/
Annual Returns on Stock, T.Bonds and T.Bills: 1928 - Current
http://pages.stern.nyu.edu/~adamodar/New_Home_Page/datafile/histretSP.html