# New user: Custom probability distribution

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## New user: Custom probability distribution

 Hello,    Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we generate the following values:   C1  C2   0   0.48   1   0.24   2   0.16   3   0.12    Now, I'm supposed to create 50 random values using this table. In MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected the columns, and it created 50 random values in a new column.[1] How do I do the same thing in R?    [1] You may be wondering why I'm telling you this. Well, it's because if I were in your shoes, I'd think "Oh, someone wants me to solve his homework.". I have already solved it using MiniTab, but I want to be able to use R instead (since I prefer NetBSD). -- Kind Regards, Jan Danielsson Te audire non possum. Musa sapientum fixa est in aure. ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html signature.asc (194 bytes) Download Attachment
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## Re: New user: Custom probability distribution

 rbinom(50,5,c(0.48,0.24,0.16,0.12)) On Thu, 2006-09-02 at 20:02 +0100, Jan Danielsson wrote: > Hello, > >    Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we > generate the following values: > >   C1  C2 >   0   0.48 >   1   0.24 >   2   0.16 >   3   0.12 > >    Now, I'm supposed to create 50 random values using this table. In > MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected > the columns, and it created 50 random values in a new column.[1] > > How do I do the same thing in R? > >    [1] You may be wondering why I'm telling you this. Well, it's because > if I were in your shoes, I'd think "Oh, someone wants me to solve his > homework.". I have already solved it using MiniTab, but I want to be > able to use R instead (since I prefer NetBSD). > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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## Re: New user: Custom probability distribution

 In reply to this post by Jan Danielsson On 2/9/2006 2:02 PM, Jan Danielsson wrote: > Hello, > >    Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we > generate the following values: > >   C1  C2 >   0   0.48 >   1   0.24 >   2   0.16 >   3   0.12 > >    Now, I'm supposed to create 50 random values using this table. In > MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected > the columns, and it created 50 random values in a new column.[1] > > How do I do the same thing in R? > >    [1] You may be wondering why I'm telling you this. Well, it's because > if I were in your shoes, I'd think "Oh, someone wants me to solve his > homework.". I have already solved it using MiniTab, but I want to be > able to use R instead (since I prefer NetBSD). You want to use the sample() function.  See ?sample. Duncan Murdoch ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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## Re: New user: Custom probability distribution

 In reply to this post by Jan Danielsson Jan Danielsson wrote: > Hello, > >    Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we > generate the following values: > >   C1  C2 >   0   0.48 >   1   0.24 >   2   0.16 >   3   0.12 > >    Now, I'm supposed to create 50 random values using this table. In > MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected > the columns, and it created 50 random values in a new column.[1] > > How do I do the same thing in R? sample( 0:3, 50, prob=c(0.48, 0.24, 0.26, 0.12)) Kjetil > >    [1] You may be wondering why I'm telling you this. Well, it's because > if I were in your shoes, I'd think "Oh, someone wants me to solve his > homework.". I have already solved it using MiniTab, but I want to be > able to use R instead (since I prefer NetBSD). > > > > ------------------------------------------------------------------------ > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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## Re: New user: Custom probability distribution

 In reply to this post by Jan Danielsson Hi, you can use our package distr respectively distrEx. require(distrEx) D1 <- DiscreteDistribution(supp=0:3, prob = 12/(25*(1:4))) plot(D1) r(D1)(50) hth Matthias >Hello, > >   Given a probability function: p(x) = 12 / (25(x+1)) , x=0, 1, 2, 3 we >generate the following values: > >  C1  C2 >  0   0.48 >  1   0.24 >  2   0.16 >  3   0.12 > >   Now, I'm supposed to create 50 random values using this table. In >MiniTab, I simply selected Calc -> Random Data -> Discrete, and selected >the columns, and it created 50 random values in a new column.[1] > >How do I do the same thing in R? > >   [1] You may be wondering why I'm telling you this. Well, it's because >if I were in your shoes, I'd think "Oh, someone wants me to solve his >homework.". I have already solved it using MiniTab, but I want to be >able to use R instead (since I prefer NetBSD). > >   > >------------------------------------------------------------------------ > >______________________________________________ >[hidden email] 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: [hidden email] Home: www.stamats.de ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html