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Answers and rating deltas for

Why the php code below is not returning the expected values?

Author Votes Δ
Eddy 2 +4.17
Ole Helgesen 1 +0.94
Alister Bulman 1 +0.79
Chad Birch 1 +0.01
bmb 0 -2.97
thirsty93 0 -2.97
Last visited: Sep 14, 2014, 5:07:29 AM