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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