From: IN%"Gregor.Gorjanc@bfro.uni-lj.si" "Gorjanc Gregor" 17-APR-2006 08:31:17.71
To: IN%"Applied-ethology@sask.usask.ca"
CC:
Subj: Help with analysis of covariance structure (correlations) between animal behaviour
Hello!
This is a data analysis (statistics) question and I hope someone here
can provide me relevant answer or point me to relevant sources.
I am analysing data on behaviour of animals. I have a factor at 1-level
and I also added animal indicator as 2-level of my model, as there is
considerable variation between animals. Very often one assumes that
2-level units are independent, but in my case this might not be the
case, since animals within one level of a factor were in contact and
might influence on each other.
I could model this dependency as say multivariate normal with particular
covariance matrix for 2-level within each factor, but I have not came
accros any such examples. I a bit skeptic in amount of information to
estimate "many" covariance components. For now compound symmetry,
unstructured and Toeplitz (in SAS parlance[1]) structures for covariance
matrix have come to my mind fot this task.
Does anyone have any experience in this type of models? Any suggestions,
comments, pointer to relevant literature are more than welcome.
Thanks!
[1]http://v8doc.sas.com/sashtml/stat/chap41/sect20.htm#mixedspcovstruct
Lep pozdrav / With regards,
Gregor Gorjanc
----------------------------------------------------------------------
University of Ljubljana
Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan
Zootechnical Department mail: gregor.gorjanc bfro.uni-lj.si
Groblje 3 tel: +386 (0)1 72 17 861
SI-1230 Domzale fax: +386 (0)1 72 17 888
Slovenia, Europe
----------------------------------------------------------------------
"One must learn by doing the thing; for though you think you know it,
you have no certainty until you try." Sophocles ~ 450 B.C.
----------------------------------------------------------------------
From: IN%"nabilbrandl@privat.dk" "Nabil Brandl" 17-APR-2006 12:15:14.36
To: IN%"Applied-ethology@sask.usask.ca" "Applied Ethology"
CC:
Subj: Covariance vs regression analysis
Here is a comparison between regression analysis and covariace analysis
http://www.uku.fi/~mauranen/advbis/advbis4.htm
Best regards
Nabil Brandl
Fax 45-86624697
Mobile: 45-40895962
e-mail: NabilBrandl@tiscali.dk
e-mail: nabilbrandl@privat.dk
e-mail: nabilbrandl@orangenet.dk
e-mail: nabilbrandl1@excite.com
http://nabilnabil.homestead.com
http://home20.inet.tele.dk/nabilbrandl/index.html
From: IN%"Gregor.Gorjanc@bfro.uni-lj.si" "Gorjanc Gregor" 17-APR-2006 15:15:19.63
To: IN%"Applied-ethology@sask.usask.ca"
CC:
Subj: RE: Covariance vs regression analysis
Nabil Brandl wrote:
>> Here is a comparison between regression analysis and covariace analysis
>> http://www.uku.fi/~mauranen/advbis/advbis4.htm
Thank you Nabil. Unfortunatelly, this does not solve my problem. I would
like to see any analysis with linear or generalized linear (possibly
also mixed) models that account for covariance between animals.
Lep pozdrav / With regards,
Gregor Gorjanc
----------------------------------------------------------------------
University of Ljubljana
Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan
Zootechnical Department mail: gregor.gorjanc bfro.uni-lj.si
Groblje 3 tel: +386 (0)1 72 17 861
SI-1230 Domzale fax: +386 (0)1 72 17 888
Slovenia, Europe
----------------------------------------------------------------------
"One must learn by doing the thing; for though you think you know it,
you have no certainty until you try." Sophocles ~ 450 B.C.
----------------------------------------------------------------------
From: IN%"nabilbrandl@privat.dk" "Nabil Brandl" 17-APR-2006 21:31:20.23
To: IN%"Gregor.Gorjanc@bfro.uni-lj.si" "Gorjanc Gregor", IN%"Applied-ethology@sask.usask.ca"
CC:
Subj: RE: Covariance vs regression analysis
Here is an article, which describe generalized and mixed model. I hope it will help you to solve your problem.
Some applications of generalized linear latent and mixed models in epidemiology: Repeated measures, measurement error and multilevel modeling: http://www.gllamm.org/epi7.pdf
Best regards
Nabil Brandl
Fax 45-86624697
Mobile: 45-40895962
e-mail: NabilBrandl@tiscali.dk
e-mail: nabilbrandl@privat.dk
e-mail: nabilbrandl@orangenet.dk
e-mail: nabilbrandl1@excite.com
http://nabilnabil.homestead.com
http://home20.inet.tele.dk/nabilbrandl/index.html
----- Original Message -----
From: "Gorjanc Gregor"
To:
Sent: Monday, April 17, 2006 11:16 PM
Subject: Re: Covariance vs regression analysis
> Nabil Brandl wrote:
>
>>> Here is a comparison between regression analysis and covariace analysis
>>> http://www.uku.fi/~mauranen/advbis/advbis4.htm
>
> Thank you Nabil. Unfortunatelly, this does not solve my problem. I would
> like to see any analysis with linear or generalized linear (possibly
> also mixed) models that account for covariance between animals.
>
> Lep pozdrav / With regards,
> Gregor Gorjanc
>
> ----------------------------------------------------------------------
> University of Ljubljana
> Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan
> Zootechnical Department mail: gregor.gorjanc bfro.uni-lj.si
> Groblje 3 tel: +386 (0)1 72 17 861
> SI-1230 Domzale fax: +386 (0)1 72 17 888
> Slovenia, Europe
> ----------------------------------------------------------------------
> "One must learn by doing the thing; for though you think you know it,
> you have no certainty until you try." Sophocles ~ 450 B.C.
> ----------------------------------------------------------------------
From: IN%"fmartin@vetmed.wsu.edu" "Martin, Francois" 18-APR-2006 14:21:13.14
To: IN%"Applied-ethology@sask.usask.ca" "Ethology Posting"
CC:
Subj: HAB course
Good Afternoon,
We have 2 upcoming courses in the Human Animal Bond that may interest =
you. Each course is a two hour long presentation which can be accessed =
starting April 24. The courses are presented by Dr. Fran=E7ois Martin, =
Associate Director of the Center for the Study of Animal Well-Being and =
Head of the People-Pet Partnership. These courses are available to =
veterinarians, veterinary para professionals and others who are =
interested in the bond between animals and humans. Each course will =
provide 2 hours of continuing education credit for veterinarians based =
on passing an online examination. =20
Please see http://www.vetmed.wsu.edu/ce/hab/ for course details and =
registration instructions.
Please distribute this information as you see fit.
Regards
FM
Francois Martin, M.A., Ph.D.
Associate Director of the Center for the Study
of Animal Well-being and
Head of the People-Pet Partnership
College of Veterinary Medicine
Washington State University
PO Box 647010
Pullman WA 99164-7010
509 335.4569
fmartin@vetmed.wsu.edu
=20
From: IN%"Gregor.Gorjanc@bfro.uni-lj.si" "Gorjanc Gregor" 18-APR-2006 18:14:56.73
To: IN%"Applied-ethology@sask.usask.ca"
CC:
Subj: Help with analysis of covariance structure (correlations) between animal behaviour
Hello!
This is a data analysis (statistics) question and I hope someone here
can provide me relevant answer or point me to relevant sources.
I am analysing data on behaviour of animals. I have a factor at 1-level
and I also added animal indicator as 2-level of my model, as there is
considerable variation between animals. Very often one assumes that
2-level units are independent, but in my case this might not be the
case, since animals within one level of a factor were in contact and
might influence on each other.
I could model this dependency as say multivariate normal with particular
covariance matrix for 2-level within each factor, but I have not came
accros any such examples. I a bit skeptic in amount of information to
estimate "many" covariance components. For now compound symmetry,
unstructured and Toeplitz (in SAS parlance[1]) structures for covariance
matrix have come to my mind fot this task.
Does anyone have any experience in this type of models? Any suggestions,
comments, pointer to relevant literature are more than welcome.
Thanks!
[1]http://v8doc.sas.com/sashtml/stat/chap41/sect20.htm#mixedspcovstruct
Lep pozdrav / With regards,
Gregor Gorjanc
----------------------------------------------------------------------
University of Ljubljana
Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan
Zootechnical Department mail: gregor.gorjanc bfro.uni-lj.si
Groblje 3 tel: +386 (0)1 72 17 861
SI-1230 Domzale fax: +386 (0)1 72 17 888
Slovenia, Europe
----------------------------------------------------------------------
"One must learn by doing the thing; for though you think you know it,
you have no certainty until you try." Sophocles ~ 450 B.C.
----------------------------------------------------------------------
From: IN%"Gregor.Gorjanc@bfro.uni-lj.si" "Gorjanc Gregor" 18-APR-2006 18:26:03.90
To: IN%"Applied-ethology@sask.usask.ca"
CC:
Subj: RE: Covariance vs regression analysis
Nabil Brandl wrote:
>> Here is a comparison between regression analysis and covariace analysis
>> http://www.uku.fi/~mauranen/advbis/advbis4.htm
Thank you Nabil. Unfortunatelly, this does not solve my problem. I would
like to see any analysis with linear or generalized linear (possibly
also mixed) models that account for covariance between animals.
Lep pozdrav / With regards,
Gregor Gorjanc
----------------------------------------------------------------------
University of Ljubljana
Biotechnical Faculty URI: http://www.bfro.uni-lj.si/MR/ggorjan
Zootechnical Department mail: gregor.gorjanc bfro.uni-lj.si
Groblje 3 tel: +386 (0)1 72 17 861
SI-1230 Domzale fax: +386 (0)1 72 17 888
Slovenia, Europe
----------------------------------------------------------------------
"One must learn by doing the thing; for though you think you know it,
you have no certainty until you try." Sophocles ~ 450 B.C.
----------------------------------------------------------------------
From: IN%"fmartin@vetmed.wsu.edu" "Martin, Francois" 18-APR-2006 23:40:14.75
To: IN%"Applied-ethology@sask.usask.ca" "Ethology Posting"
CC:
Subj: HAB course
Good Afternoon,
We have 2 upcoming courses in the Human Animal Bond that may interest =
you. Each course is a two hour long presentation which can be accessed =
starting April 24. The courses are presented by Dr. Fran=E7ois Martin, =
Associate Director of the Center for the Study of Animal Well-Being and =
Head of the People-Pet Partnership. These courses are available to =
veterinarians, veterinary para professionals and others who are =
interested in the bond between animals and humans. Each course will =
provide 2 hours of continuing education credit for veterinarians based =
on passing an online examination. =20
Please see http://www.vetmed.wsu.edu/ce/hab/ for course details and =
registration instructions.
Please distribute this information as you see fit.
Regards
FM
Francois Martin, M.A., Ph.D.
Associate Director of the Center for the Study
of Animal Well-being and
Head of the People-Pet Partnership
College of Veterinary Medicine
Washington State University
PO Box 647010
Pullman WA 99164-7010
509 335.4569
fmartin@vetmed.wsu.edu
=20