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Generalized reliability based on distances

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  • Meng Xu
  • Philip T. Reiss
  • Ivor Cribben

Abstract

The intraclass correlation coefficient (ICC) is a classical index of measurement reliability. With the advent of new and complex types of data for which the ICC is not defined, there is a need for new ways to assess reliability. To meet this need, we propose a new distance‐based ICC (dbICC), defined in terms of arbitrary distances among observations. We introduce a bias correction to improve the coverage of bootstrap confidence intervals for the dbICC, and demonstrate its efficacy via simulation. We illustrate the proposed method by analyzing the test‐retest reliability of brain connectivity matrices derived from a set of repeated functional magnetic resonance imaging scans. The Spearman‐Brown formula, which shows how more intensive measurement increases reliability, is extended to encompass the dbICC.

Suggested Citation

  • Meng Xu & Philip T. Reiss & Ivor Cribben, 2021. "Generalized reliability based on distances," Biometrics, The International Biometric Society, vol. 77(1), pages 258-270, March.
    • Handle: RePEc:bla:biomet:v:77:y:2021:i:1:p:258-270
    DOI: 10.1111/biom.13287
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    References listed on IDEAS

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    1. Philip T. Reiss & M. Henry H. Stevens & Zarrar Shehzad & Eva Petkova & Michael P. Milham, 2010. "On Distance-Based Permutation Tests for Between-Group Comparisons," Biometrics, The International Biometric Society, vol. 66(2), pages 636-643, June.
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