Hello:
With this .as file
Birth weight
ani !P
mat !P
pe 6803
sex 2 !A
aod
aod2
sy 50 !A
AdG
AdPH
AdRA
AdS
AmS
Dd
Dm
bw
PE2_2.prn !MAKE
BW21.prn
bw ~ mu sex aod aod2 sy AdG AdPH AdRA AdS AmS Dd Dm !r ani mat pe .254
0 0 1
ani 2
2 0 US 1.16 .0 .287
ani
I got this estimates for variances and covariances:
Source Model terms Gamma Component Compnt/StndErr
pe 6803 1572 0.781423E-03 0.805809E-02 0.02
Variance 3132 3099 1.00000 10.3121 19.76
ani US=UnStr 1 0.311831 3.21562 5.15
ani US=UnStr 1 0.188442E-01 0.194323 0.64
ani US=UnStr 2 -0.207402E-02 -0.213874E-01 -0.06
I have two questions:
1) It is possible to obtain negative variance estimates with the REML
algorithm
used in ASREML? (i.e., this is something that you can expect in some
situations?)
2) There is something wrong in my model setting that may explain the
negative estimate?
Thank you again
Hugo
================================
Hugo Montaldo
Research Fellow
Division of Animal Science
University of New England
Armidale, NSW 2351
Australia
Phone 61 2 67 733004
Fax 61 2 67 733275
E-mail hmontald@metz.une.edu.au
http://metz.une.edu.au/~hmontald/
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