Sufficient Sample Size and Power in Multilevel Ordinal Logistic Regression Models

Table 11

95% CI coverage rates for the estimates in a five-category ordinal response variable model by groups, group size, and intraclass correlation (method: PQL, category distribution: skewed).

Parameters	Number of groups				Group size				ICC
	30	100	120	value	5	30	50	value	0.1	0.3	0.5	value
	0.941	0.941	0.943	0.5893	0.937	0.942	0.946	0.0047	0.944	0.943	0.937	0.0611
	0.939	0.940	0.941	0.5301	0.935	0.940	0.946	0.0013	0.942	0.941	0.937	0.1578
	0.942	0.943	0.944	0.6300	0.936	0.944	0.950	0.0000	0.946	0.944	0.938	0.0160
	0.903	0.907	0.909	0.1598	0.901	0.908	0.910	0.0658	0.907	0.907	0.904	0.6272
	0.909	0.911	0.914	0.3463	0.905	0.911	0.917	0.0060	0.915	0.915	0.903	0.0037