Re: [R] dbetagen function in mc2d package

From: Ben Bolker <>
Date: Thu, 19 May 2011 17:05:13 +0000

krusty the klown <alessandrobarbiero <at>> writes:

> I found this useful package for generalized beta, yet the function that
> calculates its density leaves me puzzled, especially when I plotted it:
> plot(function(y) dbetagen(y,4,1.2,min=0,max=40),xlim=c(0,40))
> The area between the density curve and the x axis does not seem to measure
> 1!!!

  It would help to tell us that this is in the "mc2d" package ...

> integrate(dbetagen,shape1=4,shape2=1.2,min=0,max=40,0,40)
40 with absolute error < 2e-06

  I would suggest that you report this as a bug to the package maintainers [maintainer("mc2d")]. Seems fairly easy to fix for yourself, though -- just scale by the size of the domain (max-min).

  Ben Bolker mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Thu 19 May 2011 - 17:08:16 GMT

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