Come on man, at least standardize to a team baseline - i.e. subtract the team win percentage from the player's win percentage so that you can fairly compare the likes of Engelland and Bollig with last year's Flames.
It's also worth noting that Goals Versus Threshold (GVT) and specifically Defensive Gaoals Versus Threshold (DGVT) is an attempt to quantify goal prevention. It's less comprehensive than your index, but it's also subject to less noise from fluctuations in team performance.
I'm actually surprised at how intuitively reasonable your results look, if you ignore the guys with small sample sizes, big sample sizes (because it means games missed is a small sample size, and will push players very close to the team average), and who played on other teams.
(A guy who plays 82 games will be perfectly team average, even if he's Gretzky, Orr and Lemieux mixed into one.)
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