Even if something isn't measurable, you can provide anecdotal evidence that a correlation exists. If you're going to say "Methods X and Y pale in comparison to

Even if something isn't measurable, you can provide anecdotal evidence that a correlation exists. If you're going to say "Methods X and Y pale in comparison to Method Z for evaluating W" and expect anyone to draw conclusions from it, one would hope for even just a little bit of evidence.