So let's go:
| BA | OBP | SLG | HR | |
| Bill James | .288 | .322 | .443 | 14 |
| CHONE | .280 | .317 | .425 | 11 |
| Marcel | .308 | .351 | .462 | 10 |
| Oliver | .280 | .312 | .436 | 16 |
| ZiPS | .289 | .319 | .433 | 14 |
| PECOTA | .268 | .309 | .409 | 13 |
Since we're dealing with rate stats here (I threw in homers just for fun) I don't have a huge problem with averaging these numbers.
And now, the mega-projection: .286/.322/.435, down from .325/.354/.480 last season. The average actually looks like a good representation of the numbers: you've got the extremely negative PECOTA and extremely positive Marcel projections counter-balancing each other, then four others that are all around the average. I guess technically the average is always reflective, but in this case, you can see it very easily.