Quick update using tRA*

by matt-bandi on November 6, 2009

I am home from work due to an illness today, so clearly there has been just one thought running through my mind.  "I should have used tRA* instead of tRA in that post I wrote a few weeks ago."  tRA* is a regressed version of tRA, making it a better indicator of true ability and future performance.  So I figured I would post an update.

Here are the results from the previous post:

Maholm barely makes the cut as a number two starter. Duke, Morton, Ohlendorf and Karstens all rate as number threes. McCutchen comes in as an average number four pitcher, while Vasquez and Hart fell well down in the number five range.

Switching to tRA*, we find the following:

2009 starter tRA* by you.

The Pirates' rotation appears much deeper when we use tRA*.  Maholm drops down to a number three and Karstens falls to a number four, but Vasquez and McCutchen jump up to number threes and Hart climbs up to a number four.

It would be great if the Pirates had an ace or two.  However, having about eight potentially average starters available to plug into the rotation is valuable in itself.

{ 1 comment… read it below or add one }

MarkInDallas November 7, 2009 at 1:26 AM

I think Ohlie has a chance to be an ace. Morton as well. But the real breakout pitcher I’m looking at for next year is going to be Veal. I’ll bet he comes up in June and I’m very interested to see what happens.

I like to have the tRA* reference as I’m looking at these things, but I prefer to just use tRA. When I’m looking at OBP and other offensive stats, I don’t feel the need to regress them, so why with tRA? I just take into consideration the amount of data that is available for reliance.

I wish fangraphs had a running tRA tally next to ERA on a game by game basis. I really want that and I guess I’m going to have to build it myself. For example, what was the effect on tRA after Ohlendorf changed his delivery and gained velocity? Looking at WPA, there was a big difference in real quality. It would be interesting to try to estimate what next year could be like if he continues that quality stuff. You can bet his tRA would drop under 4.00.

Thanks for putting that together!

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