Results: Computation times

ADMBRE: 9 seconds.
BUGS: 7 seconds,
which was the time taken by WinBUGS 1.4 to perform
1,000 iterations of two parallel chains.



Model description
The collection of examples following WinBUGS (Volume 1, WinBUGS 1.4)
contains an application of Cox's proportional hazard model with random effects. A Weibull baseline hazard is used:
h_{0}(t) = r*t^{r1}, r>0.
The "kidney data" contain information on timetoinfection for 38 patients, and there are several explanatory variables (see table below).
A full description of the model can be found here: kidney.pdf.
Comparison with BUGS
Parameter estimates for the kidney data are shown in the following table.

b_{0} 
b_{age} 
b_{1} 
b_{2} 
b_{3} 
b_{sex} 
r 
s 
ADMBRE 
4.344 
0.003 
0.1208 
0.6058 
1.1423 
1.8767 
1.1624 
0.5617 
Std. dev. 
0.872 
0.0137 
0.5008 
0.5011 
0.7729 
0.4754 
0.1626 
0.297 
WinBUGS 
4.6 
0.003 
0.1329 
0.6444 
1.168 
1.938 
1.215 
0.6374 
Std. dev. 
0.8962 
0.0148 
0.5393 
0.5301 
0.8335 
0.4854 
0.1623 
0.357 
