Sample size requirements for estimating intraclass correlations with desired precision
Abstract
A method is developed to calculate the approximate number of subjects required to obtain an exact confidence interval of desired width for certain types of intraclass correlations in one-way and two-way ANOVA models. The sample size approximation is shown to be very accurate.
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The sample size needed for the current study was approximately 102 patients.
“the sample size needed for the current study was approximately 102 patients”
From The Psychological Flexibility in Epilepsy Questionnaire (PFEQ): Psychometric properties of the Persian version (2022) · cites this paper as [19]
The precision of ICC can be quantified by its standard error, which for ICC(1,1) is approximately given by Bonett's formula and decreases with both n and T.
“The precision of ̂ ICC can be quantified by its standard error, which for ICC(1,1) is approximately (Bonett 2002):”
From Stochasticity in Agentic Evaluations: Quantifying Inconsistency with Intraclass Correlation (2025) · cites this paper as Bonett 2002
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References 15 · Cited by 987
- Authors
- Bonett, D. G.
- Affiliations
- Iowa State University (US)
- Corresponding author
- Bonett, Douglas G.
- ORCID
- Bonett, Douglas G.
- Venue
- Statistics in Medicine
- Publisher
- Wiley
- Published
- 2002-04-10
- Volume
- 21
- Issue
- 9
- Pages
- 1331-1335
- ISSN
- 0277-6715 (ISSN-L)
- 1097-0258
- OpenAlex
- W2122517711
- Cited by
- 987
- References
- 15
- Citations by year
- 2026: 101 · 2025: 104 · 2024: 95 · 2023: 66 · 2022: 94 · 2021: 78 · 2020: 47 · 2019: 40 · 2018: 52 · 2017: 50 · 2016: 37 · 2015: 26 · 2014: 42 · 2013: 38 · 2012: 33
- FWCI
- 4.25
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Statistics in Medicine (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Clinical Trials
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
- Keywords
- sample size determination, intraclass correlation coefficient, confidence intervals, one-way ANOVA, two-way ANOVA, estimation precision
- MeSH terms
- Analysis of Variance, Child, Humans, Motor Activity, Confidence Intervals, Sample Size
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