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Originally Posted by Itse
Arbitrary means quite a few things. It also means "based on individual discretion".
Just because someone says that "these are the important numbers" doesn't make it so. This is one of the major misunderstandings of the whole fancy stats community.
Just having a system is not the same as "not arbitrary", and even further from "objective fact".
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I think it depends entirely on tbe system employed, and on the developers. Do we even know how this particular system works?
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Stats like "bad goals" can by definition only be a arbitrary because "bad" has no fixed meaning and it's not a thing you can measure. You have to just make up some definition of bad, which is probably not going to be much better than someone else's definition of bad.
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Without even knowing their definition I don't know how you can make such a claim. This depends entirely on what constitutes a bad goal, the criteria used to arrive at that definition, and the reasons for using these specific criteria. The fact is, you have no idea whether or not a "bad goal" is arbitrary because you have no idea how it has been measured. It's just a label. But I would expect given that the criteria in this case were developed by actual goalies and people who track actual goalies, then it is probably pretty reliable.
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