Kamel,
You have already had several comments suggesting some ideas for improvement,
namely,
1) correct name for iteration limit (Karl Ove Hufthammer)
2) concern about number of parameters and also possibilities of multiple minima
(Doug Bates)
3) use of optimx to allow several optimizers to be t
Ph. (410) 502-2619
email: rvarad...@jhmi.edu
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Karl Ove Hufthammer
Sent: Friday, January 21, 2011 6:48 AM
To: r-h...@stat.math.ethz.ch
Subject: Re: [R] nlminb doesn't converge and pr
On Fri, Jan 21, 2011 at 3:51 AM, kamel gaanoun wrote:
> Hi Everybody,
>
> My problem is that nlminb doesn't converge, in minimising a logLikelihood
> function, with 31*6 parameters(2 weibull parameters+29 regressors repeated 6
> times).
Hmm, the length of the parameter vector shown below is 189,
kamel gaanoun wrote:
> I use nlminb like this :
> res1<-nlminb(vect, V, lower=c(rep(0.01, 12), rep(0.01, 3), rep(-Inf,
> n-15)), upper=c(rep(Inf, 12), rep(0.99, 3), rep(Inf, n-15)), control =
> list(maxit=1000) )
>
> and that's the result :
>
> Message d'avis :
> In nlminb(vect, V, lower = c(rep
Hi Everybody,
My problem is that nlminb doesn't converge, in minimising a logLikelihood
function, with 31*6 parameters(2 weibull parameters+29 regressors repeated 6
times).
I use nlminb like this :
res1<-nlminb(vect, V, lower=c(rep(0.01, 12), rep(0.01, 3), rep(-Inf, n-15)),
upper=c(rep(Inf, 12),
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