Joey Votto had 97 plate appearances in April. In these plate appearances, Votto posted a .423 on-base percentage, 1.069 OPS, a 15.5% walk rate and was only making an out in 66.1% of plate appearances. His BABIP was .339.
In 92 plate appearances in May, Votto has a .326 on-base percentage, .610 OPS, a 10.9% walk rate, and 68.3% out rate. His BABIP is .317.
Is Votto’s performance due to expected regression (his 2015 OPS is .845) or are there other factors at play? The most obvious place for random variation, BABIP, appears to play a small role in this change.