I agree.  And the results would be more Accurate.  But given this is the 3rd longest bull run, it only leaves 2 longer bull runs to use for comparison.  There was the 7yr bull ’49 to ’56 and 13yr bull ’87 to 2000.  It seems that comparing 200dma crossing at 6yr marker of current bull run to 6yr markers of only 2 other bull runs would be too small of a sample pool for results to be accurate.  Its certainly possible my thinking on this is wrong…..especially on a late friday.  Have a good weekend.