Re: data format for multivariate analysis

From: Chanda Nimbkar <cnimbka2_at_UNE.EDU.AU>
Date: Fri, 20 May 2005 12:57:28 +1000

Dear Arthur,

Thank you for the quick response. My two repeated traits are 'fertility'
and 'live litter size' while the single measure traits are '3-month weight'
and 'lamb survival'. So there is an association between the repeated traits
and perhaps between 'litter size' and 'lamb survival' but not really
between the repeated traits and '3-month weight'. What would be the best
way to arrange the data in this case?

Not sure I understand what you mean by treating 4 traits as six traits. Do
you mean having the repeat measurements in separate columns?

Regards, Chanda

At 12:32 PM 5/20/2005, you wrote:
>Dear Chanda,
>What you propose is commonly done but may not always be best.
>It depends on the relationship between the traits; another way would be to
>treat the
>4 traits as six traits. The point is whether it is obvious which of the
>repeated trait values,
>the unrepeated trait is associated with. You need to make sure you allow
>the repeatability
>in the model.
>with God's love in the Name of Jesus Christ.
>Check out
>Arthur Gilmour PhD
>Principal Research Scientist (Biometrics)
>NSW Department of Primary Industries
>Orange Agricultural Institute, Forest Rd, ORANGE, 2800, AUSTRALIA
>fax: 02 6391 3899; 02 6391 3922 Australia +61
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Ms. Chanda Nimbkar
Ph.D. student
Animal Science (Room 35, Postgrad Annexe)
School of Rural Science and Agriculture
University of New England
Armidale, NSW 2351

Phone:Work +61-2-6773-3008
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Received on Thu May 20 2005 - 12:57:28 EST

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