R help - Feb 2006 - does multinomial logistic model from multinom (nnet) has logLik?

I want to get the logLik to calculate McFadden.R2 ,ML.R2 and
Cragg.Uhler.R2, but the value from multinom does not have logLik.So my
quetion is : is logLik meaningful to multinomial logistic model from
multinom?If it does, how can I get it?

Thank you!

ps: I konw  VGAM has function to get the multinomial logistic model
with  logLik,  but I prefer use the function from "official" R
packages .

--
ronggui
Deparment of Sociology
Fudan University

On Wed, 22 Feb 2006, ronggui wrote:
> I want to get the logLik to calculate McFadden.R2 ,ML.R2 and
> Cragg.Uhler.R2, but the value from multinom does not have logLik.So my
> quetion is : is logLik meaningful to multinomial logistic model from
> multinom?If it does, how can I get it?
>From the help page:
Value:

      A 'nnet' object with additional components:

deviance: the residual deviance.

So it has a residual deviance.  That is -2 log Lik in many cases (but not 
if the argument 'summ' is used)
> Thank you!
>
> ps: I konw  VGAM has function to get the multinomial logistic model
> with  logLik,  but I prefer use the function from "official" R
> packages .
>
> --
> ronggui
> Deparment of Sociology
> Fudan University
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

Dear ronggui,

You could use deviance().

Regards,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of ronggui
> Sent: Wednesday, February 22, 2006 7:36 AM
> To: r-help help
> Subject: [R] does multinomial logistic model from multinom 
> (nnet) has logLik?
> 
> I want to get the logLik to calculate McFadden.R2 ,ML.R2 and 
> Cragg.Uhler.R2, but the value from multinom does not have 
> logLik.So my quetion is : is logLik meaningful to multinomial 
> logistic model from multinom?If it does, how can I get it?
> 
> Thank you!
> 
> ps: I konw  VGAM has function to get the multinomial logistic 
> model with  logLik,  but I prefer use the function from 
> "official" R packages .
> 
> --
> ronggui
> Deparment of Sociology
> Fudan University
> 
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