Maximum likelihood based analysis of equally spaced longitudinal count data with first-order antedependence and overdispersion

SpringerPlus

Table 3 Estimated parameters from the GEE and ML approaches for analysis of the epilepsy data when Period is included in the models

Parameter	Estimate	SE	Wald	Pr(>\|W\|)
ML approach (\(AIC = 1566; BIC = 1579\))
Coefficients
(Intercept)	0.6569	0.1958	11.26	0.0008
Treatment	−0.1668	0.0667	6.26	0.0124
Baseline	0.0232	0.0007	1111.24	<0.0001
Age	0.0238	0.0056	17.94	<0.0001
Period	−0.0634	0.0215	8.72	0.0032
Correlation parameters
Alpha	0.416	0.0334
GEE approach
(Intercept)	0.5855	0.3491	2.81	0.0936
Treatment	−0.1642	0.1589	1.07	0.3014
Baseline	0.0232	0.0012	350.97	<0.0001
Age	0.0263	0.0118	4.95	0.0261
Period	−0.0644	0.0340	3.59	0.0580
Correlation parameters
Alpha	0.551	0.0656