Dislikedbut it's a crappy "statistic" anyway as the 80% depends on how well the fork is drawn in the first place - too many variables to base anything on, imhoIgnored
Though you are certainly entitled to your opinion, the statistic as Andrews presented it is factual. I was introduced to median lines a very long time ago, mid eighties actually, and manually did the work on the charts, not a handful but thousands of charts and many thousands of alternating pivots. From the work I have done and the work others have done(some published as academic exercises) , one can conclude it is not a "crap statistic."
Using the information, however, is up to the individual trader and his tolerance for risk and trading methodology.