Best stuff of the 2009 rookies

My latest at Hardball Times breaks down a few metrics by pitch type, just covering the 2009 debuts (thus excluding some rookies).

4 days ago Harry Pavlidis 7 comments 0 recs |

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Harry - Do you think the %'s are the best method for Pitch FX data?

It’s tough for me, not alone others, to get a reference on how good a 40% swing and miss rate is comparably.

I was talking to Tommy last night and he suggested doing pitch fx data like OPS+ is done on the 100 scale. So if a pitchers has the 40% swing and miss and the league average is 30%, he would be rated at 40/30= 133% or just 133.

Thoughts?

Jeff Zimmerman - Protecting the world from RBI's and Wins from my mom's guest house.

by Jeff Zimmerman (TucsonRoyal) on Jan 19, 2026 3:23 PM EST reply actions 0 recs

That's a good question

In a recent THT piece, I did just that - centered it all around 100. I had intended to follow that theme, but I had some data issues that I had to resolve last minute and this piece was plan B. It didn’t occur to me to apply that method, but you’re right, I should’ve to increase the ease of digestion.

Question - with rv100 and rv100E, would it make more sense to
(a) leave it centered around 0
(b) convert it to center around 100
© convert to to ERA like numbers

by Harry Pavlidis on Jan 19, 2026 4:34 PM EST up reply actions 0 recs