Quote:
Originally Posted by One Great Matrix
Any of my fellow managers, or anyone reading this, know how the ZR and EFF defensive statistics are produced? I remember listening to a report on ZR where they studied which balls they got to, & am entirely unfamiliar with EFF.
And the difference between the simmed number I can see on the reports vs. RL?
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EFF is just a straightforward percentage of how many balls in play are converted to outs. So park factors would have huge effects on this and could be very misleading. Like if you set your AVG factor to .9, you can have the "best" defense by EFF even if it's not really that good. Zone Rating is a more robust stat, where every play is judged separately, against how an "average" defender would make the play or not. The +/- number reflects the number of runs saved (or cost) above or below average. So this is generally a better stat to use if you have modified your park factors.