Is there a compilation of ratings changes throughout the Maddens?

[triplechin]

I am trying to come up with a realistic regression system. I was wondering if anyone knew of a place where Madden ratings are compiled throughout the years? Tracking different players' attribute changes throughout the maddens would help make this process more accurate. I remember someone had made their own ratings that they said were more accurate and they had a lot of data, but I can't remember their name or what to search for. Any help is appreciated, thanks. Real stats would also work too but sound much harder to get a hold of