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What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part IV (Single vs. Average Scoring)

What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part IV (Single vs. Average Scoring)

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When performing an Intraclass Correlation Coefficient (ICC) analysis, the decision between using single scorings versus average scorings relates to how you interpret the reliability of measurements and the practical context of your study. The choice affects the estimated reliability and how it applies to future measurements or decision-making. Single Scorings Single scorings ICC (often labeled as ICC(2,1) or ICC(3,1) depending on the model used) assesses the reliability of individual measurements made by a single rater or instrument. It evaluates how…

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What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part III (Consistency)

What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part III (Consistency)

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ICC (Adjusted / Consistency) is a form of the ICC that measures the consistency of measurements between raters or instruments after adjusting for systematic differences in the ratings or measurements. The “consistency” ICC does not require exact agreement on the measured values but instead evaluates whether the rankings or relative orderings of subjects by different raters are consistent, even if raters are systematically higher or lower than each other. Consistency focuses on whether raters rank subjects similarly or whether measurements…

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What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part II (Absolute Agreement)

What are other model variations that should be considered in using Intraclass Correlation Coefficients (ICC)? Part II (Absolute Agreement)

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What is ICC (Absolute Agreement, Not Adjusted)? ICC (not adjusted) / Absolute Agreement refers to one specific type of ICC model that assesses the absolute agreement between raters or measurements without adjusting for systematic differences between raters. This model variation evaluates how close the actual values of the measurements or ratings are to one another, considering both the consistency of ratings and the actual level of agreement. Absolute Agreement examines whether different raters or measurement methods give the same value…

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What is an Intraclass Correlation Coefficient (ICC)?

What is an Intraclass Correlation Coefficient (ICC)?

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In biostatistics, the Intraclass Correlation Coefficient (ICC) measures the reliability or consistency of measurements made by different observers or instruments for the same subject. It is commonly used in contexts like medical studies, psychology, and quality control to assess the agreement between raters or repeated measurements. One of the more commonly accepted classifications for deciding the type of ICC to perform is Shrout and Fleiss’s Intraclass Correlation Coefficient (ICC) classification. It is a widely-used framework introduced in their 1979 paper,…

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