The standard methods of evaluating hitters differ in their weighting of the two major elements of offensive production- getting on base and driving in baserunners (including oneself through the homer). These two elements are represented numerically, of course, by on-base percentage and slugging percentage. OPS and OPS+ treat the two elements as of equal weight. Equivalent Runs (EqR) treats the ability to get on-base as 1 and 1/2 times as important as the ability to drive in runners. Gross Production Average (GPA) weights them at 1.8 to 1. None of the methods, however, attaches different weights to different batting order positions. In general terms, this makes sense. The differences between a #4 hitter and #5 hitter, or a #6 and #8 hitter, are not large, and it is true that batters often bat in different spots in the order over the course of a season.
To evaluate career leadoff hitters though, we must acknowledge that the ability to get on base is much more important than the ability to drive in runners. The technically correct weighting will differ depending on the league due to the DH. In the National League, leadoff hitters lead off an inning grossly disproportionately because of the presence of the pitcher in the 9 slot. Pitchers disproportionately make outs and #8 hitters are consequently commonly pitched around in the National League. In the American League, leadoff hitters lead off innings less often, but still more than any other batting order position.
So, what to do? I have chosen to do a rough weighting of two times on-base percentage plus slugging percentage, but multiplied the result by 2/3 to give a similar scale to OPS. We'll call it LADOPS (Leadoff ADjusted On-Base Plus Slugging). The other aspect of being a leadoff hitter that has additional significance is speed and the ability to steal bases. We will use the very crude measures of SB success rate and SB/game to measure these attributes. We will also compare the players LADOPS with the park-adjusted league LADOPS (courtesy of BBRef.com) to generate an index of on-base plus slugging performance for leadoff hitters, adjusted for park and league.
So, what does an excellent season for a leadoff hitter look like by these measures? We'll use Craig Biggio's 1997 season, Lenny Dykstra's 1993 season, and Rickey Henderson's 1990 season, as well as Rickey's 1985 season, Tim Raines' 1985 season and Wade Boggs' 1987 season as markers. Here's the table:
Player | PAs | LADOPS | Lg. LADOPS | Index | SB success rate | SB/G |
Biggio 97 | 744 | .887 | .727 | 122 | .82 | .29 |
Dykstra 93 | 773 | .881 | .721 | 122 | .75 | .23 |
Henderson 90 | 594 | .969 | .683 | 142 | .86 | .48 |
Henderson 85 | 654 | .903 | .700 | 129 | .88 | .56 |
Raines 85 | 665 | .856 | .678 | 126 | .88 | .47 |
Boggs 87 | 667 | 1.066 | .736 | 145 | .33 | .01 |
Here is how the great lead-off hitters of the post-war era have fared over their careers:
Player | PAs | LADOPS | Lg. LADOPS | Index | SB Success % | SB/game |
Bobby Bonds | 8090 | .784 | .696 | 113 | .73 | .21 |
Ashburn | 9736 | .783 | .723 | 108 | .66 | .11 |
Brock | 11235 | .731 | .700 | 104 | .75 | .36 |
Henderson | 13346 | .814 | .703 | 116 | .80 | .46 |
Raines | 10389 | .797 | .707 | 113 | .84 | .32 |
Boggs | 10740 | .848 | .725 | 117 | .41 | .01 |
Molitor | 12160 | .791 | .713 | 111 | .79 | .19 |
Biggio | 11948 | .780 | .725 | 108 | .77 | .15 |
We'll leave Dick McAulliffe and Luis Aparicio for another day.
Next up, I take a closer look at Tim Raines.