R help - Jun 2013 - Weighted SUR/NSUR

Hi,
Is it possible
to run SUR with weights using systemfit? I mean weighted seemingly unrelated
regression (weighted SUR) or weighted nonlinear unrelated regression (weighted
NSUR).  Parresol (2001) in his paper
titled Additivity of nonlinear biomass
equations has run weighted NSUR using PROC MODEL (SAS institute Inc.1993).
I was wondering if r can do that. Thanks.
Tarquinio Mateus
Magalhães

___________________________
Tarquinio Mateus Magalhães
www.tarqmag.blogspot.com
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Dear Tarquinio

On 29 Jun 2013 21:01, "Tarquinio magalhaes"
<tarqmag@yahoo.com.br> wrote:
> Is it possible
> to run SUR with weights using systemfit? I mean weighted seemingly
unrelated
> regression (weighted SUR)
Currently, systemfit cannot estimate (SUR) models with observation-specific
weights :-(
> or weighted nonlinear unrelated regression (weighted NSUR).
We are still not yet finished with implementing nonlinear models in
systemfit (see http://www.systemfit.org/) :-(
>  Parresol (2001) in his paper
> titled Additivity of nonlinear biomass
> equations has run weighted NSUR using PROC MODEL (SAS institute Inc.1993).
> I was wondering if r can do that.
Unfortunately not (see above). As several people have asked for
observation-specific weights and NSUR, I should perhaps start a
crowd-funding initiative for implementing these features.

BTW: You can ask questions that are specific to systemfit via the help
forum at systemfit's R-Forge site:
https://r-forge.r-project.org/projects/systemfit/

Best wishes,
Arne

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