Now that FanGraphs is publishing MGL's UZR, I wanted to see how the 2008 results compared to David Pinto's PMR (which I converted to runs here).
I ran a quick correlation for each position containing the players qualified according to PMR - those who were on the field for at least 1000 balls in play.
| Position | Correlation |
| Pitcher | NA |
| Catcher | NA |
| First Baseman | 0.71501645 |
| Second Baseman | 0.58129407 |
| Third Baseman | 0.62672569 |
| Shortstop | 0.68798239 |
| Left Fielder | 0.74839581 |
| Center Fielder | 0.52849967 |
| Right Fielder | 0.80255003 |
There were definitely some issues in center field, and to a lesser extent 2B. The two systems had a high level of agreement in the corner OF positions.
The 10 biggest disagreements were:
| Player | Position | PMR | UZR | Diff |
| Akinori Iwamura | 2B | -17.25 | 0.6 | 17.85 |
| Pedro Feliz | 3B | -10.19 | 7.2 | 17.39 |
| Troy Glaus | 3B | -13.85 | 3.3 | 17.15 |
| Edgar Renteria | SS | -16.14 | 0.9 | 17.04 |
| Jose Reyes | SS | -18.21 | -1.5 | 16.71 |
| Brad Hawpe | RF | -21.64 | -37.2 | 15.56 |
| Melvin Mora | 3B | -17.81 | -3 | 14.81 |
| Torii Hunter | CF | 4.81 | -9.8 | 14.61 |
| Dan Uggla | 2B | 14.85 | 0.3 | 14.55 |
| Bobby Abreu | RF | -11.45 | -25.2 | 13.75 |
Both PMR and UZR were calculated using the Baseball Info Solutions (BIS) data set this season. I wonder if David or MGL might be able to give some ideas as to where the differences might come from.
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