Comparison of confidence interval methods for an intra-class correlation coefficient (ICC)

Table 6 DC lung study results

ICC_brange	Frequency of features	Interval method	Mean pseudo-coverage	Mean width	Median width	SD widths
0.72-1	5,571	GCI	96.5%	0.439	0.446	0.131
0.72-1	5,571	NIB	96.7%	0.520	0.530	0.154
0.52- < 0.72	5,571	GCI	97.2%	0.594	0.607	0.061
0.52- < 0.72	5,571	NIB	94.8%	0.664	0.675	0.078
0.23- < 0.52	5,571	GCI	98.2%	0.594	0.616	0.068
0.23- < 0.52	5,571	NIB	96.3%	0.591	0.619	0.109
0- < 0.23	5,571	GCI	99.2%	0.405	0.422	0.142
		NIB	85.9%	0.346	0.340	0.128

Summary of 22,283 confidence intervals, one for each feature, broken down by ICC_b quartiles. GCI is generalized confidence interval method, and NIB is Bayesian method with noninformative prior distribution. Pseudo-coverage is the proportion of times the full data ICC_b was contained in the interval.

ISSN: 1471-2288