No. of Recommendations: 15
I wouldn't be too hasty in jumping to a conclusion on this. Though, I will say, Jim is the creator of the method and certainly has the right to state its default/standard lookback.

Personally, I ran analysis on:

1. Multiple indexes - the more the better
2. Broken into decades, and then averaged

I don't put a lot of confidence in a single index with a single period for drawing any conclusions. Just my two cents, of course. Everyone is welcome to choose whatever method they prefer. It is probably best that we are not all following the same rule set with any timing or trading system.
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