[R] Zeta and Zipf distribution

[Mauro Rossi]

Dear David,
	thank you for your reply.
I tried to use the package VGAM, the function "zipf" and also the 
function "zetaff", but these functions don't allow me to estimate 
parameters directly, I have to use a Gerneralized Linear Model or a 
Generalized Additive Model (vgam or vglm functions) and I don't want to 
use those. Don't you know a way to apply these tools to my data?
At the end my PMF has to be Y=f(X) where f(X) is a zeta or a zipf 
distribution, while using VGAM the PMF is Y = b0 + b1*f(X1)+ ... 
+bn*f(Xn). Do you know how I can write the script using the VGAM 
function for the PMF I need?

Thank you in advance,

Mauro Rossi
	

David Barron ha scritto:
> Does the zipf function in the VGAM package do what you want?
> 
> On 08/02/07, *Mauro Rossi* <Mauro.Rossi a irpi.cnr.it 
> <mailto:Mauro.Rossi a irpi.cnr.it>> wrote:
> 
>     Dear R user,
>     I want to estimate the parameter of ZETA or/and ZIPF distributions
>     using R, given a series of integer values. Do you know a package
>     (similar to MASS) or a function (similar to fitdistr) I can use to
>     estimate the parameter of these distributions using MLE method?
>     Otherwise do you know a function (which use MLE method to estimate
>     distribution parameters) that allow me to specify a PDF or PMF?
>     Thanks,
>     Regards
>     Mauro Rossi
> 
>     --
>     Mauro Rossi
>     Istituto di Ricerca per la Protezione Idrogeologica
>     Consiglio Nazionale delle Ricerche
>     Via della Madonna Alta, 126
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>     Italia
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> 
> -- 
> =================================
> David Barron
> Said Business School
> University of Oxford
> Park End Street
> Oxford OX1 1HP

-- 
Mauro Rossi

Istituto di Ricerca per la Protezione Idrogeologica

Consiglio Nazionale delle Ricerche

Via della Madonna Alta, 126

06128 Perugia

Italia

Tel. +39 075 5014421

Fax +39 075 5014420