A team of statisticians developed a model to predict books that would hit big. Trouble is, books like “The Da Vinci Code” didn’t rate high in the model. “This year’s runaway bestseller should have had only a 36% chance of reaching the charts, according to Alvai Winkler and his team. Their model fits work by some topselling authors but gives only middling marks to the Harry Potter titles and rules out almost everything by Charles Dickens except for his lesser-known Christmas story The Battle of Life.”