Do Certain Hitter Profiles Increase Year-To-Year Consistency? by Jeff Zimmerman January 31, 2018 As for now, I can’t find any find any predictability to year-to-year hitter consistency once adjusting for plate appearances. For the readers looking for a short article, stop now and move on to Paul’s thesis on starting pitchers. For the stubborn ones, here is what I’ve additionally found out after previously investigating the subject. On Monday, I could not find any predictability for hitter being consistency. That is not entirely true, I did find that the more plate appearances a hitter accumulates, the more likely they are to reach their true talent level. And if given the opportunity to be closer to their talent level, the more consistent their output. The one factor I thought might point to year-to-year consistent play in a player’s statistical profile. Are power hitters inconsistent because a few gusts of wind could make a difference in a half-dozen home runs? Do high-walk hitters see their stats as being more consistent since walks stabilize faster? Basically, are certain hitter types more consistent on a yearly basis. To measure of year-to-year consistency, I will again use the standard deviation of OPS. Using a three-year sample (min 100 PA in each season), I compared the constancy value to several metrics. Here are the r-squared values for players with the three-year average number of PA listed. R-Square Values for Y2Y Consistency To Other Stats PA/R-squared BB% K% Contact% GB% ISO PA >100 .003 .036 .025 .012 .011 .063 >250 .003 .034 .024 .012 .013 .053 >400 .011 .025 .019 .013 .023 .031 >500 .016 .013 .011 .016 .015 .016 >600 .000 .032 .020 .000 .000 .020 100 to 300 .003 .071 .056 .018 .000 .003 300 to 500 .003 .033 .028 .019 .044 .011 The largest r-squared in the whole table is .071 with several zeros scattered around. Not for being related. The truth is that as a player accumulates more and more plate appearances, they get closer to their true talent. As Bill Petti found at the Hardball Times, day to day volatility is dependant on the type of hitter. Hitters that tend to hit the ball in the air for power tend to produce in a more volatile fashion, while groundball hitters with higher on-base skills appear to produce more closely to their average on a daily basis. His concept makes sense with some hitter’s power coming in bunches over a whole season. But once a hitter gets to 600 PA for several seasons in a row, we know who we think they are. Even the most stubborn stats (e.g. BABIP) begin to stabilize within a few seasons and a hitter’s talent level is revealed. If an owner wants a reliable hitter, find one with the most plate apperances in the past three or four seasons. I figured I’d find some consistency like Petti saw. I was wrong. For those owners looking for some level of year-to-year consistency, start at the top of a multi-year plate appearance leaderboard.