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[QUOTE="upperdeck, post: 3250455, member: 474"]
they gather data at PFF  but "PFF uses qualitative and opinion-based grading as the root of its 0-100 Player Grades -- not its advanced statistics " "Player Grades are not truly quantitative and could be seen as being prone to bias, poor sample sizing, or other issues "

its a bias based rating system thats not really based on real facts.  so 2 players doing the same thing could end up with different numbers

i you run the same play in 2 systems against the same D.

one system says read middle, deep, check down and the other says read deep, middle check down and the throw goes to the middle it gives a grade to both plays based on the success of the play.  but if the middle /deep throws are both open and guy one reads it correctly and throws to middle and guy 2 reads it incorrectly and throws to the middle they get the same grade even though ones the correct throw and one isnt.

both plays worked and gained 15 yds, but one should have been a 50 yd td.  it doesnt know that.

We had this issue a ton in YR one with ED in this system.
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