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XFip is a variation of FIP that takes into account the homerun a little more. it more or less takes into account how lucky they were given there fly ball to homerun ratio. and Sierra is probably my favorite right now as it is a bit new it is a more in depth. Both Fip and XFIP focus mostly on the "three true outcomes." Strike outs, walks, and homeruns". Sierra works in other results that can also improve or decrease a pitchers success.
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