Question about batter "split" ratings

[diamond3017]

Say I have a RH hitter and a LH hitter who have identical batting ratings against LHP (i.e. Con vL, etc). Do the LHB's ratings already account for the fact that LHP generally have better ratings against LHB? Or is that something you need to factor in on your own?

Now say you're making a platoon decision – if this is already baked in to the hitter ratings, then it wouldn't matter which batter you picked. But if it isn't, you'd go with the RHB. You might even choose the RHB if his ratings were slightly worse.

[robc]

The ratings represent how the player will do vs. righties and lefties, so you don't need to adjust them from those values.

[diamond3017]

Originally Posted by robc

The ratings represent how the player will do vs. righties and lefties, so you don't need to adjust them from those values.

But if a pitcher has 60-60-60 STU/MOV/CON vs. RHB and 65-65-65 STU/MOV/CON vs. LHB, then the RHB would effectively be facing a worse pitcher. So wouldn't his ratings would effectively be better than a LHB's, even if both batters had nominally identical hitting ratings vs. LHP?

[robc]

Originally Posted by diamond3017

But if a pitcher has 60-60-60 STU/MOV/CON vs. RHB and 65-65-65 STU/MOV/CON vs. LHB, then the RHB would effectively be facing a worse pitcher. So wouldn't his ratings would effectively be better than a LHB's, even if both batters had nominally identical hitting ratings vs. LHP?

In your example, the pitcher is more effective vs LHBs because his ratings are higher vs lefties. Now, the batter's ratings matter too so if this pitcher faced a poor RHB he would on average to better than facing a great LHB.

Basically you just need to look at the batters ratings vs the handedness of the pitcher and the pitcher's ratings vs the handedness of the batter.

[CBeisbol]

The ratings you see, remember, are a reflection of the underlying stats.

A left-handed batter, or pitcher, has a different expectation against same and opposite handed pitchers.

So, say a left-handed hitter has a .300 expected batting average against left-handed pitchers and a .320 expected batting average against right-handed pitchers. That's against the *average* pitcher of that handedness. They'd be expected to hit better vs worse pitchers and worse vs better ones. So, you can say that it's already baked in.

I'd think that a left-handed hitter should have the same expectation vs both a left-handed and right-handed pitcher with the same underlying stats vs left-handed batters. A left-handed hitter with 50-50-50-50-50 vs a left-handed pitcher with 50-50-50 vs left-handed hitters should perform the same vs a right-handed pitcher who is 50-50-50 vs left-handed hitters.