[R] binomial distribution

Peng Jiang jp021 at sjtu.edu.cn
Fri Jun 27 16:44:45 CEST 2008

Hi, xiechao
  i don't think that is a R specific problem. you mean u got two  
random variables X,Y and both
of them binomial distributed and you want to find the distribution of  
a new variable Z = X/Y.
That is a basic transformation problem. u can start with introducing a  
new r.v. namely W, by
  letting it equal to X you obtain W=X,Z=X/Y from which u have X = W  
and Y  = W / Z.  It is easy
to find the Jacobian of this transformation, and the left is routinely.

On 2008-6-27, at 下午8:29, Xie Chao wrote:

> Hi all,
> I am a biological student and need your help in statistics.
> I have two sets of  binomial distributed numbers: {a1, a2, ..., an}  
> and {b1,
> b2, ..., bn}.
> How can I get the distribution of the ratios of the two sets of  
> numbers
> {a1/b1, a2/b2, ..., an/bn}? Is there a formula to transform the
> distributions? Or where I can start if I want to learn necessary  
> techniques?
> Thank you a lot!
> xiechao
> 	[[alternative HTML version deleted]]
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Peng Jiang
Ph.D. Candidate
Antai College of Economics & Management
Department of Mathematics
Shanghai Jiaotong University (Minhang Campus)
800 Dongchuan Road
200240 Shanghai
P. R. China

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