maximum covariance analysis
http://www.biomedcentral.com/1471-2105/10/272/
von Storch H, Zwiers FW: Statistical Analysis in Climate Research. Cambridge University Press; Cambridge; 1999.
http://books.google.com/books?id=IJuCVtQ0ySIC&pg=PA580&lpg=PA580&dq=maximum+covariance+analysis&source=bl&ots=amIlnUzMH1&sig=8urhs8oFUrNysGZyxEVNRAC6uoQ&hl=en&sa=X&ei=fWZnT-DgHcSU0QG2sPmcCA&ved=0CGkQ6AEwCDgK#v=onepage&q=maximum%20covariance%20analysis&f=false