Re: iexp in many dimensions

From: Jarrod Hadfield <J.Hadfield_at_ed.ac.uk>
Date: Wed, 13 Aug 2008 09:40:46 +0100

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Hi Arthur,

Thanks for the advice, I'll give it a go. Sorry about the email
address - I was using auto complete on asreml.

Thanks,

Jarrod
On 13 Aug 2008, at 08:33, arthur.gilmour_at_dpi.nsw.gov.au wrote:

>
> Dear Jarrod
>
> First. If you have me in your address book, please ensure my
> address is either arthur_at_cargovale.com.au or
> arthur.gilmour_at_dpi.nsw.gov.au. My old address @agric.nsw.gov.au
> will soon become inactive.
>
> re:
>
> I was wondering whether it's possible to use an isotropic exponential
> variance structure when there are more than 2 dimensions (many
> dimensions in fact)? It does not seem to be possible to pass
> multiple coordinates x,y,z.... , but I was wondering whether it's
> possible to pass a user defined distance matrix? Something like the
> giv function?
>
> Thanks,
>
> You can probably achieve your purpose using the 'MYOWNGDG' procedure.
> Look up the !OWN qualifier and the OWN variance model.
> You will need to write a program which reads a file ASReml prints
> which contains the
> variance parameters for the model,
> calculates the inverse and derivatives,
> writes them to file
>
> and ASReml reads them back in.
>
> There isn't a way of getting a distance matrix in per se.
>
>
>
> May Jesus Christ continue to be gracious to you,
>
> Arthur Gilmour, His servant .
>
> Mixed model regression mapping for QTL detection in experimental
> crosses. Computational Statistics and Data Analysis 51:3749-3764
> at http://dx.doi.org/10.1016/j.csda.2006.12.031
>
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>
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> mailto:Arthur.Gilmour_at_dpi.nsw.gov.au, arthur_at_cargovale.com.au
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>
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Received on Fri Aug 13 2008 - 09:40:46 EST