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  1. I think the rationale for K/BFP (at THT, we multiply BFP by 38, or the average number of batters per game in a given league in a given year) is stronger than that. Good pitchers are definitely underrated by K/9, because they face less batters per nine innings (that’s not just walks, but hits allowed, too). I guess the difference is “minimal,” but that depends on your expectations, right? Also, the differences are biased — good pitchers are underrated and bad pitchers are overrated — which makes K/9 less insightful and more misleading.

    Comment by studes — March 13, 2008 @ 8:49 am

  2. I don’t think that makes K/9 is any less insightful as long as you know what you’re using. In all honesty they are really insanely similar with a r-squared of .96. The biggest difference you’re ever really looking at is not much more than 1 K per 9/G.

    But, with that said, the players who have their K/9 most “undervalued” compared to K/G were typically those who had pretty good or great seasons. And likewise players who were most “overvalued” were players with poor seasons.

    With K/G there’s a slight possibility (and I do mean ever so slight) you may be missing out on a potential breakout pitcher since it undervalues pitchers with high K/9 that walked a lot of batters and gave up a lot of hits. It’s tough to say K/9 undervalues players that already have K/G up in the 9+ range which is already quite high.

    I don’t think either of these stats should be used in isolation, but if you had to use one in isolation I probably would use K/G. Assuming I had the rest of the stats on hand like BB/9 (or whatever flavor of that you want) along with HR/FB etc… I’d probably stick with K/9.

    Comment by David Appelman — March 13, 2008 @ 10:54 am

  3. Not to drag it out, but why exactly do you prefer K/IP over K/BFP?

    Comment by studes — March 15, 2008 @ 7:47 am

  4. I think it isolates strikeout potential better than K/BF does.

    Comment by David Appelman — March 15, 2008 @ 9:08 am

  5. I also agree that K/IP is the best approach to reading the numbers in gauging potential for pitchers. You definitely have a keeper if your closer gets over 8.

    Comment by Sofla Baseball — May 16, 2011 @ 3:31 pm

  6. Yeah I’d say 8-9 is pretty high.

    Comment by Ryan — October 25, 2011 @ 12:39 am

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