These certificate programs that people talk about might have credibility in London but in the US I've never even heard them mentioned. Osas, "rankings" for a stat program make little sense to me. UCLA has a list on their site from 1995 and there are some great programs that aren't even on that list. My understanding also is that "rankings" are more skewed towards theoretical than applied programs.
http://www.stat.ucla.edu/program/ranking.phpStat programs generally aren't geared to people who work in finance they are geared towards people who either want to teach, work in industry, or at pharma companies. But anyone who "gets it" should easily be able to take the tools they teach you in regression, time series, etc and be able to apply them to financial markets.Being that Columbia as a university has a such a good name most people are going to assume their stat program is great. I would also think Columbia has advantages such as locality where you should be able to easily network with NY firms. If you look at that list Wisconsin has a great program (theoretical) but look at the location. Things to think about.