[R-sig-Geo] HELP: Fitting a model variogram

[Kapo Coulibaly]

Can you share your variogram (a graph) and your initial parameters?

On Wed, Feb 8, 2017 at 1:55 AM, Kareem Longwe <kareemlongwe at gmail.com>
wrote:

> Dear all
> I am trying to fit a model variogram, but I am stuck on *ini.cov.pars. *I
> am working in R.
>
> Would anyone give me a clue how to estimate the 'partial sill and range'. I
> have tried changing numbers but I continuously get the following error
> message in R:
>
>  Warning messages:
> 1: In variofit(vario.pht, cov.model = "exponential", ini.cov.pars =
> initial.values,  :
>   unreasonable initial value for sigmasq (too high)
> 2: In variofit(vario.pht, cov.model = "exponential", ini.cov.pars =
> initial.values,  :
>   unreasonable initial value for sigmasq + nugget (too high).
>
> Thanks
>
> *Kareem Longwe*
> *NEPADSAN*Bio Student Ambassador
> MSc Student, Agronomy
> Lilongwe University of Agriculture and Natural Resources
> P.O. Box 219.
>
> klongwe at bunda.luanar.mw
> +265 996 31 66 22
>
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>
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