The human mind is an amazing thing. We can see pattern and reason in almost anything if we seek it.
I remember attending my first Gann seminar and walking out 30 minutes into a 2hr presentation (I had paid for it as well) thinking what a load of garbage this is, and I knew very little about TA at the time. If you do some research into the history of W.D. Gann it might be revealing as to the efficacy of his method of prediction. Brilliant in hindsight though.
I am always amazed by the subjectivity and endless variation that can be applied to such things as waves, triangles and diagonal lines. I think if enough people believe something however it does become self fullfilling in a market; such measures inclube 'fib' levels and the like.
Does anybody have positive expectancy stats to post from subjective measures that could compare favourably to random entries combined with sound money management?