Editing Peripheral ERA (section)

'''Peripheral ERA''' (PERA) is a [[pitch (baseball)|pitching]] statistic created by the [[Baseball Prospectus]] team.  It is the expected [[earned run average]] taking into account park-adjusted hits, walks, strikeouts, and home runs allowed.  Unlike [[Voros McCracken]]'s [[Defense independent pitching statistics|DIPS]], hits allowed are included. PERA doesn't attempt to eliminate the effect of luck on batted balls away from ERA, instead attempting to account for good (or bad) luck in the combinations of hits, walks, home runs, and strikeouts. A lower PERA than EqERA (adjusted ERA) may indicate poor luck which may even itself out in the future, leading to a lower EqERA despite no change in quality of pitching.