Comments on: Pictures and Steroids Again http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/ Economic Thinking about Baseball Sun, 09 Jan 2011 17:16:18 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: JC http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/comment-page-1/#comment-5381 JC Tue, 09 May 2006 18:19:12 +0000 http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/#comment-5381 I should also mention that the CoV estimates are for pitchers with a minimum of 100 BFP. I should also mention that the CoV estimates are for pitchers with a minimum of 100 BFP.

]]> By: Kenny http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/comment-page-1/#comment-5380 Kenny Tue, 09 May 2006 18:16:24 +0000 http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/#comment-5380 Thanks for the clarification. I'm trying to think of the meaning we can take from the graphs. I think the first graph might not be the best one to use because of the relief pitcher issue. The second graph seems more promising, but I think it also has a flaw in that it weights equally pitchers who pitched 10 innings and those that pitched 150 innings. Would it make sense/is it possible to make yet another graph, this time weighting the HR rates by the innings pitched (without just ending up with the first graph)? In any case, assuming we are happy with a given one of these graphs despite any drawbacks, would one interpret increasing dispersion over time to support the hypthesis that hitters are feasting on bad pitchers, and a graph with decreasing dispersion to provide evidence against it? Thanks for the clarification. I’m trying to think of the meaning we can take from the graphs. I think the first graph might not be the best one to use because of the relief pitcher issue. The second graph seems more promising, but I think it also has a flaw in that it weights equally pitchers who pitched 10 innings and those that pitched 150 innings. Would it make sense/is it possible to make yet another graph, this time weighting the HR rates by the innings pitched (without just ending up with the first graph)?

In any case, assuming we are happy with a given one of these graphs despite any drawbacks, would one interpret increasing dispersion over time to support the hypthesis that hitters are feasting on bad pitchers, and a graph with decreasing dispersion to provide evidence against it?

]]> By: JC http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/comment-page-1/#comment-5379 JC Tue, 09 May 2006 17:53:13 +0000 http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/#comment-5379 Sorry Kenny, I fixed the label on the second graph, which measures the dispersion of the home runs allowed rate (HRA/BFP). The first graph measures the dispersion of raw home runs allowed by pitchers. Sorry Kenny,

I fixed the label on the second graph, which measures the dispersion of the home runs allowed rate (HRA/BFP). The first graph measures the dispersion of raw home runs allowed by pitchers.

]]> By: Kenny http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/comment-page-1/#comment-5378 Kenny Tue, 09 May 2006 17:25:46 +0000 http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/#comment-5378 Oh, I read it again and I think I figured it out .. is it possible that the first graph is "CoV of HRs Allowed" (looking at what pitchers gave up) and the second graph is "Cov of HRs hit" (looking at what hitters hit)? If so, would the increasing trend in the first graph and the decreasing trend in the second graph provide evidence for your hypothesis that over time the abilities of pitchers has spread out at a greater rate than the abilities of hitters? Oh, I read it again and I think I figured it out .. is it possible that the first graph is “CoV of HRs Allowed” (looking at what pitchers gave up) and the second graph is “Cov of HRs hit” (looking at what hitters hit)? If so, would the increasing trend in the first graph and the decreasing trend in the second graph provide evidence for your hypothesis that over time the abilities of pitchers has spread out at a greater rate than the abilities of hitters?

]]> By: Kenny http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/comment-page-1/#comment-5377 Kenny Tue, 09 May 2006 17:23:26 +0000 http://www.sabernomics.com/sabernomics/index.php/2006/05/pictures-and-steroids-again/#comment-5377 JC, Could you please clarify what the second graph shows? You have the Y-axis labeled the same in both graphs. The first graph I figure is CoV = (standard deviation)/(mean). You indicate in the text that the second graph is "dispersion." I thought CoV was a measure of disersion? Can you explain what is different about the second graph? Any possible reasons for the difference? Thanks! JC, Could you please clarify what the second graph shows? You have the Y-axis labeled the same in both graphs. The first graph I figure is CoV = (standard deviation)/(mean). You indicate in the text that the second graph is “dispersion.” I thought CoV was a measure of disersion? Can you explain what is different about the second graph? Any possible reasons for the difference? Thanks!

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