Independent Variable
|
Log Prevalence Ratio Estimate† (SE)
|
P-Value
|
---|
|
Log-Binomial
|
Robust Poisson
|
Log-Binomial
|
Robust Poisson
|
---|
Log(Rate)
|
1.3132 (0.3362)
|
1.5578 (0.4270)
|
0.0006
|
0.0003
|
Log(Volume)
|
0.7715 (0.1960)
|
1.4614 (0.3510)
|
0.0002
|
0.0000
|
- * Wald tests were used for the Robust Poisson method, and likelihood ratio tests were used for the log-binomial method. The latter were obtained by fitting a model without the effect being tested. The log-binomial method failed to converge when both independent variables were in the model and when only log(Volume) was in the model. In these cases, the COPY method approximation was used.
-
† The intercept estimate was -1.5147 for the log-binomial method and -1.8311 for the Robust Poisson method. Of the 39 probability estimates, 3 were greater than unity for the Robust Poisson method, and the largest was 1.82.