BMC Medical Research Methodology

Table 2 Normal simulation table

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

		b₀= 48, l₀= 3, r₀= 1		b₀= 96, l₀= 6, r₀= 1
ICC_w	Method	Coverage	Average width (SEM)	Coverage	Average width (SEM)
0.99	GPQ	0.949	0.755 (0.0014)	0.947	0.523 (0.0009)
0.99	MLS	0.950	0.758 (0.0014)	0.948	0.525 (0.0009)
0.99	Bayes	0.858	0.825 (0.0012)	0.930	0.570 (0.0009)
0.90	GPQ	0.943	0.685 (0.0014)	0.948	0.448 (0.0010)
0.90	MLS	0.946	0.690 (0.0014)	0.949	0.450 (0.0010)
0.90	Bayes	0.858	0.788 (0.0010)	0.943	0.497 (0.0010)
0.80	GPQ	0.955	0.595 (0.0014)	0.943	0.331 (0.0009)
0.80	MLS	0.957	0.602 (0.0014)	0.946	0.334 (0.0009)
0.80	Bayes	0.848	0.749 (0.0008)	0.956	0.378 (0.0010)
0.71	GPQ	0.959	0.373 (0.0011)	0.954	0.156 (0.0002)
0.71	MLS	0.968	0.377 (0.0012)	0.957	0.156 (0.0002)
0.71	Bayes	0.933	0.678 (0.0009)	0.964	0.169 (0.0003)

ICC_b = 0.70 setting. Highlighted are coverages below 90%. The means of the ICC_b point estimates when b₀ = 48, l₀ = 3 were 0.74, 0.72, 0.70 and 0.69, with standard deviations 0.17, 0.14, 0.09 and 0.06 as the values of the ICC_w decreased from 0.99 to 0.71. When b₀ = 96, l₀ = 6 the means of the ICC_b estimates were 0.72, 0.71, 0.70 and 0.70 with standard deviations 0.12, 0.10, 0.06, and 0.04 as the ICC_w decreased from 0.99 to 0.71.

Back to article page

ISSN: 1471-2288

Contact us

General enquiries: journalsubmissions@springernature.com