Subject: Re: Timing: Zweig Breadth Thrust indicator
According to this site:
https://humblestudentofthemark...
there were seven out-of-sample buy signals since the 1986 publication and the S&P was higher a year later in all instances.

It may be a fantastic indicator, but it's not clear that the above statement alone necessarily means that.
The S&P generally goes up, so what are the chances that if you pick seven dates at random the S&P would be higher a year later?
Or some test like that, I haven't really thought it about much other than to think 'somebody oughta think about it'