Quote from David Aronson:
When I say a TA approach is untestable it is not a function of the testing method but rather of the TA approach. Untestable, in science in general or EBTA in particular, simply means that the approach does not make specific testable claims. Thus any TA approach that is not sufficiently well defined that that it would be possible to reduce to a back-testable algorithm means that the approach has not made explicit all application issues. Or said differently, it requires some subjective interpretation on the part of the user of the approach ( e.g. Gann Lines, classic chart patterns, etc.). With respect to a method like Elliot, it has now been reduced to a testable method, at least according to Robert Precter. This is discussed in his book Socionomics Chapter 4, where the describes the EWAVES program. So, whereas Elliot Wave Theory had been an untestable subjective method, there is now, according to Precter, a version that is objective, meaningful, testable.... The results of these test have not yet been made public. But when they are we will be in a position to judge the value of this particular version of EWT. Prior to this time, its value had to be taken on faith.
David Aronson