Re: iexp in many dimensions

From: <arthur.gilmour_at_DPI.NSW.GOV.AU>
Date: Wed, 13 Aug 2008 17:33:39 +1000

Dear Jarrod

First. If you have me in your address book, please ensure my address is
either or My old
address will soon become inactive.


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?


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

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Skype: arthur.gilmour,
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Received on Fri Aug 13 2008 - 17:33:39 EST

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