Reading the article on the app the author lays out that the range of % of time that teams allow an opponent to exit the zone with possession ranges from 35% (Tampa) to 46% (Calgary)
They go on to talk about how with linechanges every minute or so there is a natural amount of zone exits allowed and that the next thing they want to look at would be how well a team controls zone exits after a faceoff and a lost draw.
They are also going to work on a combined metric that has zone entry, zone exit etc. all rolled into one.
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