Press Inquiries To contact M.J. about an interview, appearance or other engagement, please e-mail her.     ART BY NUMBERSAmazon ruleBY CLEA SIMON If we, the literate public, believe that information is empowering, then it stands to reason that we should applaud Amazon.com’s new "concordance" and "text-stat" features. These services, launched with no fanfare in early March, offer statistical analyses of books by measuring such elements as word repetition, average number of syllables per word, and words per sentence. These features (which seem to have been applied primarily to current works by contemporary authors — no Jane Austen, for instance — and Amazon isn’t saying why) also provide the "Fog…