On a recent vacation in London, I dined at a much-buzzed-about new Gordon Ramsay venture (the York and Albany) and some trendy Soho tables, but the best meal I ate was a simple lunch at this unprepossessing "caff" in the East End hipster-ville of Shoreditch.
Our methodology was simple: Look at our top-25 Ebook Best-Seller list since we launched the thing over the summer and see how many titles each publisher had on the list each week and then add them up.
At their best, these sites provide clear and accurate performance data instead of just trumpeting their winners, and have simple methods for back-testing results.
Think of credit rating as a simple grading system where the top students perform the best on tests (making money) and those at the bottom are the biggest risk for dropping out of school (defaulting).