RiggoDrill wrote:because almost all 3B are overpriced
I have to say, I was clueless when I read this, because positional adjustments are somewhat arbitrary: you just need to use what makes sense. If one position is systemically overpriced, you just need to change your position adjustment, and there is no other way since there is no "objective" way to define how one defensive position relates to another.
Here is a quote from the Society of American Baseball Research (my italics):
The values used for the position adjustments we use currently [...] were agreed upon and are the ones used by our sister site, FanGraphs:
Catcher: +12.5 runs (all are per 162 defensive games)
Shortstop: +7.5 runs
Second Base: +2.5 runs
Third Base: +2.5 runs
Center Field: +2.5 runs
Right Field: -7.5 runs
Left Field: -7.5 runs
First Base: -12.5 runs
Designated Hitter: -17.5 runs
We could agree or disagree with these adjustments. Personally, I would have adjusted differently left fielders and right fielders since the quality of arm has more impact in rf than in lf. But in any case, the point is to show that even the best sabermetricians didn't know how to formulate the positional adjustment: they used something that made sense. They used a scale so that the best shortstops are similar on the WAR scale compared to the best outfielders.
Doing the positional adjustments for Strat is different since you have to integrate the X-chart to the adjustment. But the end point is not far from the values above. Here is the average adjustment I have in my own ratings per position (this is actually an integration of positional adjustment and defensive value as generated by the defensive ratings--defensive value set at zero in the case of dh)
Catcher: +2 runs (mine are based on 150 defensive games)
Shortstop: +7 runs
Second Base: +5 runs
Third Base: +2 runs
Center Field: +4 runs
Right Field: -1 run
Left Field: -4 runs
First Base: -4 runs
Designated Hitter: -10 runs
The fact that the two positional adjustments are similar in scale is not surprising because SOM didn't want Omar Vizquel being priced higher than Ted Williams on the mere fact that Vizquel gets 170 more outs during the course of a season on the X-chart. We all know Ted Williams was the better player, and so the salary structure must reflect this. And therefore, the positional adjustment SOM used (deliberately or not) had to reflect this.
The catcher position shows the biggest difference between the agreed set of positional adjustments by sabermetricians and the ones used (as I estimate it) in SOM. And I think SOM got it wrong here. Cochrane and Yogi Berra were considered among the top 10 best players of their era, together they collected 5 MVP, but somehow their best cards are valued in the 6M-7M zone??? Something is wrong here. Had SOM used the positional adjustment agreed upon by sabermetricians, both Berra and Cochrane would have cards in the 8M zone at minimum.
Of course, I set my own positional adjustments so that I don't end up with massing overpriced or underpriced cards at any position. Had I used the 12.5 catcher adjustment, I would have a ton of underpriced cards, so that's why I settled on only +2 runs.
But if SOM is about to rescale the pricing structure, I would definitively suggest that it uses a positional adjustment so that the best catchers are more in line with how the baseball community perceived them.