Hi, just curious, I have taught myself a good chunk of statistics , up to non-parametric methods, but I don't have any official proof of it, i.e., I don't have a degree on it I could use to convince a potential employer. I know in other areas one may use, e.g., the GRE to show one's competence when one does not have a degree. The only thing I can think of is taking the AP test in Statistics. Would that be good-enough evidence ( of course, assuming I get a good grade) to an employer of my competence in statistics? Is there some other way of certifying this? Thanks.