Dear Albyn,
 
Thanks for your reply. 
 
Yes "A" and "B" are unknown. I was just thinking to assign -
 
A = min(amounts) and B = max(amounts).
 
The actual loss data I am dealing with is large. I am trying to fit some statistical distributions to this data. I already have done with R code pertaining to many other distributions like Normal, Weibull, Pareto, Generalized extreme Value distribution etc. So just want to know how to estimate the parameters if I need to check whether the Beta distribution fits the loss data.
 
Is it possible for you to guide me how to estimate A and B or can I assume A = min(amounts) and B = max(Amounts)
 
Regards
 
Maithili
 
 
 


--- On Wed, 7/10/09, Albyn Jones <jones@reed.edu> wrote:


From: Albyn Jones <jones@reed.edu>
Subject: Re: [R] Parameters of Beta distribution
To: JLucke@ria.buffalo.edu
Cc: "Maithili Shiva" <maithili_shiva@yahoo.com>, r-help@r-project.org, r-help-bounces@r-project.org
Date: Wednesday, 7 October, 2009, 3:30 PM


Are A and B known?  That is, are there known upper and lower bounds
for this credit loss data?  If not, you need to think about how to
estimate those bounds.  Why do you believe the data have a beta distribution?

albyn


On Wed, Oct 07, 2009 at 09:03:31AM -0400, JLucke@ria.buffalo.edu wrote:
> Rescale your data x to  (x-A)/(B-A).
> 
> 
> 
> 
> Maithili Shiva <maithili_shiva@yahoo.com> 
> Sent by: r-help-bounces@r-project.org
> 10/07/2009 08:39 AM
> 
> To
> r-help@r-project.org
> cc
> 
> Subject
> [R] Parameters of Beta distribution
> 
> 
> 
> 
> 
> 
>  
> Supose I have a data pertaining to credit loss as
>  
> amounts <- 
> c(46839.50,31177.12,35696.69,21192.57,29200.91,42049.64,42422.19, 
> 44976.18, 32135.36,47936.57,27322.91,37359.09,43179.60, 48381.02, 
> 45872.38, 28057.30,44643.83,36156.33,16037.62, 45432.28)
>  
> I am trying to fit Beta distribution (two parameters distribution but 
> where lower bound and upper bounds are NOT  0 and 1 respectively). For 
> this I need to estimate the two parameters of Beta distribution. I found 
> some code in VGAM pacakge but it deals with standard Beta distribution 
> i.e. lower bound (say A) = 0 and upper bound (say B) = 1.
>  
> How do I estimate the parameters of the Beta distribution for above data 
> where A and B are not 0's?
>  
> Please guide.
>  
> Thanking you in advance
>  
> Maithili 
> 
> 
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