RATE STATS Are Straightforward Percentages:
K% = Strike Outs (K) / Plate Appearances
BB% = Walks (BB) / Plate Appearances
These are two variables a pitcher can directly control.
Rate Stats v Differential
When assessing a pitcher, is it better to look at his strikeout to walk ratio, or his strikeout minus walk differential?
Exploring The Application of K% & BB%:
“Strikeouts, Walks – Ratio or Differential?” (Inside The Book)