was all that I was referring to when I was reminded of a trade scenario that was discussed for a week near the deadline. When the leading proponent for a stat "system(s)" uses the tool exclusively for defining value so vastly over-shoots the reality of return, it is probably a good time to question the validity of the process.
I've seen statements claiming that the big-league clubs are actively using all or parts of these valuation models in personnel decisions. This is an example which shows that we are a bit too confident in our conclusions as of now. From what I can see (excellent post above, Sandy) UZR is assisting in overstating defense and where I can see the utility in the system for comparing different positions to some extent, the over all result is skewing the relative importance of defensive players.
Systems are broken IMO that show any left fielder to be more important defensively than the CF next to him.
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