The Short, Short Josh Donaldson Trade Story Based on Platoon Splits
by Ken Arneson
2014-12-01 11:22

Ok, look, I told y’all with the Cespedes trade that you can’t analyze an A’s trade of a position player without breaking it down by platoon splits across the whole lineup. But did any of y’all listen to me? No. Y’all are still trying to analyze Donaldson vs Lawrie as if they are single players on single teams instead of two players on two platoon teams with other players on the team. So stop that.

Now look, I’m gonna make this simple. I’m going to assume that both Lawrie and Donaldson will be equally healthy, and they’re roughly comparable defensive players. They may not be, but this is a quick and dirty exercise here, so bear with me. And I’m just going to use OPS, so I don’t have to make this story as long as the other Josh Donaldson story that’s coming later today.

Let us begin.

* * *

OPS 2014/career, Josh Donaldson vs. RHP: .727 / .744
OPS 2014/career, Josh Donaldson vs. LHP: 1.007 / .953

OPS, 2014/career Brett Lawrie vs RHP: .760 / .760
OPS, 2014/career Brett Lawrie vs LHP: .595 / .713

See, Brett Lawrie is actually better than Josh Donaldson against RHPs. The difference is that Donaldson crushes LHPs, and Lawrie for whatever reason actually is worse against LHPs than RHPs. He was particularly bad in 2014. I do not know why.

So for the platoon team that plays 2/3s of the A’s games, the one against RHPs, the A’s lineup actually just got better.

* * *

So now we need to fix the 1/3 of the A’s games against LHPs.

Last year, one of the A’s primary 1B/DHs against LHPs was Alberto Callaspo. He was awful. The A’s have signed Billy Butler to replace him.

OPS 2014/career, Alberto Callaspo vs LHP: .518 / .729
OPS 2014/career, Billy Butler vs LHP: .847 / .912

So the A’s are losing about .400 OPS points by downgrading from Donaldson to Lawrie vs LHPs, but they get back about .300 of those OPS points by upgrading from Callaspo to Butler.

So now all Billy Beane has to do find that extra .100 points of OPS against LHPs, and the math works. Maybe it will come just out of the fact that most players don’t have reverse splits last their whole careers, and Lawrie will actually bounce back and hit better against LHPs in the future. If so, QED.

* * *

Disclaimer: the above analysis does not mean I like this trade. I do not like this trade. That (much longer) explanation is here.

This is Ken Arneson's blog about baseball, brains, art, science, technology, philosophy, poetry, politics and whatever else Ken Arneson feels like writing about
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