[R] New user: Custom probability distribution

2006-02-09 Thread Jan Danielsson
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.



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Re: [R] New user: Custom probability distribution

2006-02-09 Thread Duncan Murdoch
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

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Re: [R] New user: Custom probability distribution

2006-02-09 Thread tom wright
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).
 
 __
 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

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Re: [R] New user: Custom probability distribution

2006-02-09 Thread Kjetil Brinchmann Halvorsen
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).
 
 
 
 
 
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 R-help@stat.math.ethz.ch mailing list
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Re: [R] New user: Custom probability distribution

2006-02-09 Thread Matthias Kohl
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).

  



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