Showing posts with label projecting pitcher performance forecasting david price 2009. Show all posts
Showing posts with label projecting pitcher performance forecasting david price 2009. Show all posts

Thursday, January 8, 2009

Are Pitchers Really Harder To Project?

An anonymous commenter on my David Price post had this to say:

You are totally nuts dude. look at his age and experience, coupled with his strikeout totals. No doubt this kid is a k per inning guy when he gets some time under his belt.


He may be right about Price's long term potential, but my post was really focused on how good Price is right now.

The common wisdom seems to be that future pitching performance is harder to predict than future hitting performance. In one sense that's true, but in some ways it's completely wrong.

What is true is that long term improvement is harder to forecast. The vast majority of 20 year old hitters will be substantially better five years in the future than they are now. The same really can't be said of pitchers. Some will suffer major injuries. Others will have more subtle problems with arm strength, mechanics, or other aspects of pitching that reduce their effectiveness. Many will never be better than they are at 20, although some will also reach their full potential later than almost any hitter. So in that sense, the common wisdom is correct. Pitchers' long term development is much harder to predict.

The good news is that in many cases we don't actually NEED to forecast development in pitchers. We can simply recognize changes in true ability faster than others. When a 21 year old hitter with a career average of .250 hits .320 in April, I have no idea if the change is permanent or simply short term variance. However, when a 21 year old pitcher with career ratios of 5.0 for strikeouts and 4.0 for walks completes the first month of the season with a ratio of 35/8 in 31 innings, I can be nearly certain that he's become a much better pitcher than he used to be. If I'm lucky, he'll have suffered enough bad luck to keep his ERA high, obscuring his true talent level, and allowing me to get a bargain.

So getting back to my anonymous friend...while he may be right about Price, we really have no idea. And rather than guess about the development of a young pitcher, I'd rather wait and see. Once (if) he becomes a "k per inning guy" it will be apparent within about five starts...and at that point Price is likely to be slightly undervalued in most leagues.