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Sample size requirements for reliability studies

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Reliability and Agreement in Measurement Statistical Methods in Clinical Trials Statistical Methods and Bayesian Inference

Abstract

This paper provides exact power contours to guide the planning of reliability studies, where the parameter of interest is the coefficient of intraclass correlation rho derived from a one-way analysis of variance model. The contours display the required numbers of subjects k and number of repeated measurements n that provide 80 per cent power for testing Ho: rho less than or equal to rho 0 versus H1: rho greater than rho 0 at the 5 per cent level of significance for selected values of rho o. We discuss the design considerations of these results.

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References

1977The Measurement of Observer Agreement for Categorical Data 1979Intraclass correlations: Uses in assessing rater reliability.

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2011Guidelines for estimating repeatability 2007Interrater Reliability of Algometry in Measuring Pressure Pain Thresholds in Healthy Humans, Using Multiple Raters 1994Statistical Methodology for the Concurrent Assessment of Interrater and Intrarater Reliability: Using Goniometric Measurements as an Example 2002Sample Size Requirements for Testing and Estimating Coefficient Alpha 2002Kappa coefficients in medical research 2012Sample size formulas for estimating intraclass correlation coefficients with precision and assurance 2014Recommendations for reporting the results of studies of instrument and scale development and testing 2004Sample size requirements for the design of reliability study: review and new results

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