Baseball · Models
Environment reference
Historical ballpark and umpire reference data, separated from model training and release evidence.
Reference factors
Ballpark & umpire influences
Multi-season factors vs league average (1.00 = neutral), computed from the Retrosheet play-by-play pipeline (2010-2022, league 8.8 runs/game).
Historical reference factors are not evidence that these values were applied to a current prediction. See the game notebook and input health for actual usage. Venue changes and the source period matter.
| COL | 1002 | 11.35 | 1.290 | 1.177 | 1.270 |
| BOS | 1003 | 10.06 | 1.144 | 1.007 | 1.152 |
| TEX | 1003 | 9.92 | 1.127 | 1.124 | 1.105 |
| TOR | 994 | 9.41 | 1.070 | 1.228 | 1.060 |
| ARI | 1002 | 9.42 | 1.070 | 1.009 | 1.018 |
| BAL | 1002 | 9.39 | 1.067 | 1.267 | 1.075 |
| MIN | 1003 | 9.28 | 1.054 | 0.996 | 1.019 |
| CIN | 1000 | 9.15 | 1.040 | 1.212 | 1.069 |
| NYA | 1003 | 9.12 | 1.036 | 1.256 | 1.003 |
| DET | 999 | 9.12 | 1.036 | 0.939 | 0.957 |
| KCA | 1002 | 9.01 | 1.025 | 0.823 | 1.044 |
| CHA | 1001 | 8.92 | 1.014 | 1.096 | 1.012 |
| MIL | 1004 | 8.89 | 1.011 | 1.130 | 0.968 |
| PHI | 1007 | 8.74 | 0.994 | 1.068 | 1.019 |
| WAS | 1004 | 8.71 | 0.990 | 1.006 | 1.042 |
| CLE | 1001 | 8.70 | 0.989 | 0.982 | 0.955 |
| CHN | 1006 | 8.69 | 0.988 | 0.992 | 0.977 |
| FLO | 159 | 8.61 | 0.979 | 0.773 | - |
| ANA | 1004 | 8.59 | 0.977 | 1.030 | 1.034 |
| ATL | 1001 | 8.58 | 0.975 | 0.907 | 1.035 |
| HOU | 1000 | 8.54 | 0.971 | 1.046 | 0.961 |
| PIT | 1003 | 8.42 | 0.957 | 0.799 | 1.002 |
| OAK | 1003 | 8.29 | 0.943 | 0.896 | 0.920 |
| SLN | 999 | 8.22 | 0.934 | 0.830 | 0.915 |
| MIA | 832 | 8.06 | 0.916 | 0.756 | 0.903 |
| LAN | 1003 | 7.93 | 0.902 | 1.000 | 0.939 |
| NYN | 1001 | 7.91 | 0.899 | 0.921 | 0.883 |
| SEA | 999 | 7.90 | 0.898 | 0.993 | 0.929 |
| TBA | 1004 | 7.87 | 0.894 | 0.927 | 0.889 |
| SFN | 1006 | 7.83 | 0.890 | 0.702 | 0.935 |
| SDN | 1004 | 7.81 | 0.888 | 0.877 | 0.909 |