[R] discrete probability distribution
Hi I want to sample from a discrete random variable X, defined on the non-negative integers, with prob(X=0) = (1-p) prob(X=1) = (1-p)*p ... prob(X=i)=(1-p)*p^i ... Before reinventing the wheel, is there a ready-made R function to give me such a thing? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] discrete probability distribution
Hi, have a look at http://mathworld.wolfram.com/GeometricDistribution.html respectively http://mathworld.wolfram.com/NegativeBinomialDistribution.html with r = 1. In R have a look at ?rnbinom with n = 1 and in your case: prob = 1-p hth Matthias Hi I want to sample from a discrete random variable X, defined on the non-negative integers, with prob(X=0) = (1-p) prob(X=1) = (1-p)*p ... prob(X=i)=(1-p)*p^i ... Before reinventing the wheel, is there a ready-made R function to give me such a thing? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- StaMatS - Statistik + Mathematik Service Dr. rer. nat. Matthias Kohl Gottlieb-Keim-Straße 60 95448 Bayreuth Phone: +49 921 50736457 E-Mail: [EMAIL PROTECTED] Home: www.stamats.de __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] discrete probability distribution
On 23-Feb-06 Robin Hankin wrote: Hi I want to sample from a discrete random variable X, defined on the non-negative integers, with prob(X=0) = (1-p) prob(X=1) = (1-p)*p ... prob(X=i)=(1-p)*p^i ... Before reinventing the wheel, is there a ready-made R function to give me such a thing? Use rgeom(n,(1-p)) Note (from ?rgeom) that these functions use the definition P(n) = p*(1-p)^n i.e. the complementary value of p to the one in your description. Best wishes, Ted. E-Mail: (Ted Harding) [EMAIL PROTECTED] Fax-to-email: +44 (0)870 094 0861 Date: 23-Feb-06 Time: 09:18:50 -- XFMail -- __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
