What’s with this on base percentage obsession? Is that Bill James bullshit?

Moneyball (2011)
POLONI
A screenplay character in Moneyball (2011).
- lines
- 4
- words
- 75
- scenes
- 1
- dialogue
- 0.5%
- avg words / line
- 19
- shortest / longest
- 6 / 43
Sample dialogue
Billy, if I may, he’s had his problems on the field -- not to mention his problems off the field -- not to mention he’s getting a little thick around the middle -- there’s the stuff with the weed. He’s at strip joints...
scene 27, source scene 32 — INT. SCOUTING ROOM - DAYAlright, so he walks a lot.
scene 27, source scene 32 — INT. SCOUTING ROOM - DAYThese three players, by your own admission, are defective in one way or another.
scene 27, source scene 32 — INT. SCOUTING ROOM - DAYWhat’s with this on base percentage obsession? Is that Bill James bullshit?
scene 27, source scene 32 — INT. SCOUTING ROOM - DAY
Bookends
These three players, by your own admission, are defective in one way or another.