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Table 2 Comparison between DHGLM estimates and the estimates obtained by Sorensen & Waagepetersen [6] (referred to as S&W 2003 below)

From: Genetic heterogeneity of residual variance - estimation of variance components using double hierarchical generalized linear models

    

Model for residual variance

 
  

Mean model

Fixed effects

Variances

 

Model

 

b 0

δ ins

δ par

ρ

I

DHGLM

1.40

0.60

2.00

     
 

S&W 2003

1.40

0.60

2.00

     

II

DHGLM

1.38

0.73

1.87

-0.15

0.34

   
 

S&W 2003

1.37

0.71

1.87

-0.15

0.34

   

III

DHGLM

1.35

0.53

1.73

-0.17

0.32

0.13

 

*

 

S&W 2003

1.58

0.60

1.78

-0.16

0.34

0.11

 

-0.57

IV

DHGLM

1.36

0.44

1.72

-0.17

0.32

0.09

0.06

*

 

S&W 2003

1.62

0.60

1.77

-0.17

0.35

0.09

0.06

-0.62

  1. b0 is the intercept term in the model for the residual variance
  2. δ ins is the fixed effect of insemination in the model for the residual variance
  3. δ par is the fixed effect for the difference in first and second parity in the model for the residual variance
  4. *The correlation between a and a d was not estimated with DHGLM
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Genetics Selection Evolution

ISSN: 1297-9686