Statistical modelling

The table alongside, together with the equations, shows how the estimated variance components, indicated by s2r s2d and s2e respectively, are derived from the matrix coefficient and stratum variance values – see GenStat output on previous page.

  

 

  sr2 (ram) sd2 (ewe) se2 (lamb) Stratum variance
  0.067 1.457 3.427  
Coefficients        
Ram 10.31 0.42 1 4.733
Ewe

0

 2.10 1 6.490
Residual

0

      0 1 3.427

Ram mean square = 10.31 x sr2 + 0.42 x sd2 + 1 x se2 = 4.733  

Ewe mean square = 2.10 x sd2 +1 x se2 = 6.490  

Residual (lamb) mean square = 1 x se2 = 3.427

 

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