Comments on: Using Deserved Run Average http://milwaukee.locals.baseballprospectus.com/2018/05/01/using-deserved-run-average/ Just another Baseball Prospectus Local Sites site Tue, 13 Nov 2018 16:53:42 +0000 hourly 1 http://wordpress.org/?v=4.1.1 By: Nicholas Zettel http://milwaukee.locals.baseballprospectus.com/2018/05/01/using-deserved-run-average/#comment-23999 Fri, 04 May 2018 10:04:35 +0000 http://milwaukee.locals.baseballprospectus.com/?p=11609#comment-23999 This is a really good question. I’m going to look into this.

]]> By: Philip Schumacher http://milwaukee.locals.baseballprospectus.com/2018/05/01/using-deserved-run-average/#comment-23979 Wed, 02 May 2018 21:11:23 +0000 http://milwaukee.locals.baseballprospectus.com/?p=11609#comment-23979 I have a question about how standard deviation is used. In the table above, it appears that the estimated DRA is assumed to have a normal distribution and that there is no skewness to the data. However, DRA has a minimum of zero and a maximum of infinity. So as a pitcher’s DRA approaches zero, the distributions of the estimate is likely no longer normal but may be a gamma distribution, for example. In that case the standard deviation may differ for values to the “left” of the most likely value vs to the “right”. Would it be statically more accurate to assume a non-normal distribution and have the standard deviation differ for DRA?

Thank you for the article and discussion – I think this is a great way to better evaluate players.

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