Estimate Standard error
Intercepts    
α0 0.851 0.354
α1 2.863 0.293
Slopes    
γ0 2.309 0.307
γ1 -3.347 0.419
Variance-covariance terms
1.369  
0.687  
ρ 0.935  
Table 2: REML estimates of parameters in model (6) when applied to the PCR data.