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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:
h0(t) = r*tr-1, r>0.
The "kidney data" contain information on time-to-infection 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.
|
b0 |
bage |
b1 |
b2 |
b3 |
bsex |
r |
s |
ADMB-RE |
-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 |
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