Kukla's Korner Hockey
by Paul on 10/17/11 at 12:24 PM ET
from Jared Diamond of the Wall Street Journal,
Save percentage has long been considered the best way to evaluate NHL goaltenders, despite an obvious flaw: It does not account for the difficulty of shots the goalie faces, which is dictated largely by the defense playing in front of him.
Michael Schuckers, a statistics professor at St. Lawrence University, sought to rectify that problem by devising a metric called “defense independent goalie rating,” or DIGR. The stat is an adjusted save percentage that reveals the true ability of the goalie—regardless of his defensemen.
Schuckers mapped every shot each goalie faced last season, allowing him to isolate a goalie’s save percentage against shots from every location on the ice. He put those findings against a plot of every shot taken in the NHL in order to estimate how each goalie would fare not just against the shots he faced, but against the shots all the goalies faced—therefore putting them all up against the same shots.
thanks to a KK member for the pointer
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Paul Kukla founded Kukla’s Korner in 2005 and the site has since become the must-read site on the ‘net for all the latest happenings around the NHL.
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