More on the methodology here: http://intelligenceengine.blogspot.com/2014/11/game-outcomes-project-methodology-in.html http://intelligenceengine.blogspot.com/20

More on the methodology here: http://intelligenceengine.blogspot.com/2014/11/game-outcomes-project-methodology-in.html http://intelligenceengine.blogspot.com/2014/11/game-outcomes... tl;dr it's very similar to the DORA report, though they had an external reference point in the form of metacritic scores.