Comments on: The Top Scores for Canabalt, Take 2 http://www.johnmyleswhite.com/notebook/2009/11/15/the-top-scores-for-canabalt-take-2/ "He who refuses to do arithmetic is doomed to talk nonsense." Mon, 05 Jul 2010 19:57:28 +0000 hourly 1 http://wordpress.org/?v=3.0 By: John Myles White http://www.johnmyleswhite.com/notebook/2009/11/15/the-top-scores-for-canabalt-take-2/comment-page-1/#comment-17789 John Myles White Thu, 19 Nov 2009 20:39:15 +0000 http://www.johnmyleswhite.com/?p=3605#comment-17789 Thanks for the suggestion, Owe. I had thought at one point that the distribution looked a bit like some parametrizations of the F distribution, but couldn't come up with a theoretical motivation for using it: the gamma seems much more appropriate because of its origin in a sum of exponentials. Any suggestions on how to fit the gamma in R? My first pass, below, crashes because <code>Nan</code>'s are produced. <code> library(MASS) fitdistr(data.set$score, "gamma") </code> Thanks for the suggestion, Owe. I had thought at one point that the distribution looked a bit like some parametrizations of the F distribution, but couldn’t come up with a theoretical motivation for using it: the gamma seems much more appropriate because of its origin in a sum of exponentials. Any suggestions on how to fit the gamma in R? My first pass, below, crashes because Nan‘s are produced.


library(MASS)
fitdistr(data.set$score, "gamma")

]]> By: Owe Jessen http://www.johnmyleswhite.com/notebook/2009/11/15/the-top-scores-for-canabalt-take-2/comment-page-1/#comment-17788 Owe Jessen Thu, 19 Nov 2009 19:10:56 +0000 http://www.johnmyleswhite.com/?p=3605#comment-17788 How about a gamma distribution? It should give you a fairly decent approximation.Bound at zero, and you can fit a lot of curves to it, see http://en.wikipedia.org/wiki/File:Gamma_distribution_pdf.png How about a gamma distribution? It should give you a fairly decent approximation.Bound at zero, and you can fit a lot of curves to it, see http://en.wikipedia.org/wiki/File:Gamma_distribution_pdf.png

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