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August 18, 2010

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The argument lists in this table for the beta, chisq, f and t distributions are incomplete. R allows for a non-centrality parameter, ncp, in each of these distributions. (If I recall correctly, S-PLUS does not but I don't have a copy of that software available to check.)

Allowing for non-central versions of these distributions in R took a considerable amount of work, especially by Martin Maechler, and I think it should be acknowledged.

Thanks for pointing that out Doug, I updated the post above. Martin and others from the R project definitely deserve a round of applause -- the accuracy of these functions, especially in the tails, is unparalleled. I didn't include some of the other parameters like lower.tail which give even more accuracy in some situations -- follow the links in the table to read up on the other options.

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