A simple approximation for calculating sample sizes for comparing independent proportions - PubMed (original) (raw)
- PMID: 26625475
Comparative Study
A simple approximation for calculating sample sizes for comparing independent proportions
J L Fleiss et al. Biometrics. 1980 Jun.
Abstract
A simple approximation is provided to the formula for the sample sizes needed to detect a difference between two binomial probabilities with specified significance level and power. The formula for equal sample sizes was derived by Casagrande, Pike and Smith (1978, Biometrics 34 , 483-486) and can be easily generalized to the case of unequal sample sizes. It is shown that over fairly wide ranges of parameter values and ratios of sample sizes, the percentage error which results from using the approximation is no greater than 1%. The approximation is especially useful for the inverse problem of estimating power when the sample sizes are given.
Similar articles
- Formulae and tables for the determination of sample sizes and power in clinical trials for testing differences in proportions for the two-sample design: a review.
Sahai H, Khurshid A. Sahai H, et al. Stat Med. 1996 Jan 15;15(1):1-21. doi: 10.1002/(SICI)1097-0258(19960115)15:1<1::AID-SIM134>3.0.CO;2-E. Stat Med. 1996. PMID: 8614740 Review. - Bayesian sample size calculations for a non-inferiority test of two proportions in clinical trials.
Daimon T. Daimon T. Contemp Clin Trials. 2008 Jul;29(4):507-16. doi: 10.1016/j.cct.2007.12.001. Epub 2007 Dec 23. Contemp Clin Trials. 2008. PMID: 18201944 Review.
Cited by
- Early diagnosis and treatment of postoperative endoscopic recurrence of Crohn's disease: partial benefit by infliximab--a pilot study.
Sorrentino D, Terrosu G, Paviotti A, Geraci M, Avellini C, Zoli G, Fries W, Danese S, Occhipinti P, Croatto T, Zarifi D. Sorrentino D, et al. Dig Dis Sci. 2012 May;57(5):1341-8. doi: 10.1007/s10620-011-2025-z. Epub 2012 Jan 18. Dig Dis Sci. 2012. PMID: 22252267 Clinical Trial. - Prediction of metabolic syndrome among postmenopausal Ghanaian women using obesity and atherogenic markers.
Arthur FK, Adu-Frimpong M, Osei-Yeboah J, Mensah FO, Owusu L. Arthur FK, et al. Lipids Health Dis. 2012 Aug 10;11:101. doi: 10.1186/1476-511X-11-101. Lipids Health Dis. 2012. PMID: 22883105 Free PMC article. - The relationship of lifetime substance-use disorder with family functioning, childhood victimisation, and depression, among juvenile offenders in Malaysia.
Wahab S, Baharom MA, Abd Rahman FN, A Wahab K, Zulkifly MA, Azmi AD, Ahmad N. Wahab S, et al. Addict Behav Rep. 2021 May 27;14:100359. doi: 10.1016/j.abrep.2021.100359. eCollection 2021 Dec. Addict Behav Rep. 2021. PMID: 34136633 Free PMC article. - Efficacy of active hexose correlated compound on survival of patients with resectable/borderline resectable pancreatic cancer: a study protocol for a double-blind randomized phase II study.
Hashimoto D, Satoi S, Ishikawa H, Kodera Y, Kamei K, Hirano S, Fujii T, Uemura K, Tsuchida A, Yamada S, Yamamoto T, Hirota K, Sekimoto M. Hashimoto D, et al. Trials. 2022 Feb 12;23(1):135. doi: 10.1186/s13063-021-05934-x. Trials. 2022. PMID: 35151367 Free PMC article. - artbin: Extended sample size for randomized trials with binary outcomes.
Marley-Zagar E, White IR, Royston P, Barthel FM, Parmar MKB, Babiker AG. Marley-Zagar E, et al. Stata J. 2023 Mar;23(1):24-52. doi: 10.1177/1536867X231161971. Epub 2023 Apr 5. Stata J. 2023. PMID: 37461744 Free PMC article.