Asymptotic Distribution Free Interval Estimation

Author:

Coffman Donna L.1,Maydeu-Olivares Alberto2,Arnau Jaume2

Affiliation:

1. Methodology and Prevention Research Centers, The Pennsylvania State University, USA

2. Faculty of Psychology, University of Barcelona, Spain

Abstract

Abstract. Confidence intervals for the intraclass correlation coefficient (ICC) have been proposed under the assumption of multivariate normality. We propose confidence intervals which do not require distributional assumptions. We performed a simulation study to assess the coverage rates of normal theory (NT) and asymptotically distribution free (ADF) intervals. We found that the ADF intervals performed better than the NT intervals when kurtosis was greater than 4. When violations of distributional assumptions were not too severe, both the intervals performed about the same. The point estimate of the ICC was robust to distributional violations. We provide R code for computing the ADF confidence intervals for the ICC.

Publisher

Hogrefe Publishing Group

Subject

General Psychology,General Social Sciences

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