Literature DB >> 9990694

Sample size formula with a continuous outcome for unequal group sizes and unequal variances.

H J Schouten1.   

Abstract

Guenther derived a simple formula for the accurate computation of equal sample sizes when the two-sample t-test with pooled variance estimate is used. In the present paper, the Guenther formula is generalized to the case of unequal sample sizes. In addition, the case of unequal variances is considered.

Mesh：

Year:  1999        PMID： 9990694     DOI： 10.1002/(sici)1097-0258(19990115)18:1<87::aid-sim958>3.0.co;2-k

Source DB:  PubMed          Journal:  Stat Med        ISSN： 0277-6715            Impact factor:   2.373


  4 in total

1.  Optimal treatment allocation for placebo-treatment comparisons in trials with discrete-time survival endpoints.

Authors:  Mirjam Moerbeek; Weng-Kee Wong
Journal:  Stat Med       Date:  2015-06-28       Impact factor: 2.373

2.  Efficient design of cluster randomized trials with treatment-dependent costs and treatment-dependent unknown variances.

Authors:  Gerard J P van Breukelen; Math J J M Candel
Journal:  Stat Med       Date:  2018-06-10       Impact factor: 2.373

3.  Optimal designs for group randomized trials and group administered treatments with outcomes at the subject and group level.

Authors:  Mirjam Moerbeek
Journal:  Stat Methods Med Res       Date:  2019-05-01       Impact factor: 3.021

4.  Optimal allocation to treatments in a sequential multiple assignment randomized trial.

Authors:  Andrea Morciano; Mirjam Moerbeek
Journal:  Stat Methods Med Res       Date:  2021-09-23       Impact factor: 3.021
  4 in total

北京卡尤迪生物科技股份有限公司 © 2022-2023.