Re: [R] Sample size Determination to Compare Three Independent Proportions

Hi Marc: Thank you for your help in this matter. With thanks Abou On Tue, Aug 10, 2021, 9:28 AM Marc Schwartz wrote: > Hi, > > A search would suggest that there may not be an R function/package that > provides power/sample size calculations for the specific scenarios that > you are describi

Re: [R] Sample size Determination to Compare Three Independent Proportions

Hi, A search would suggest that there may not be an R function/package that provides power/sample size calculations for the specific scenarios that you are describing. There may be something that I am missing, and there is also other dedicated software such as PASS (https://www.ncss.com/softw

Re: [R] Sample size Determination to Compare Three Independent Proportions

Hi Marc: First, thank you very much for your help in this matter. Will perform an initial omnibus test of all three groups (e.g. 3 x 2 chi-square), possibly followed by all possible 2 x 2 pairwise comparisons (e.g. 1 versus 2, 1 versus 3, 2 versus 3), We can assume *either* the desired sample s

Re: [R] Sample size Determination to Compare Three Independent Proportions

Hi, You are going to need to provide more information than what you have below and I may be mis-interpreting what you have provided. Presuming you are designing a prospective, three-group, randomized allocation study, there is typically an a priori specification of the ratios of the sample s

[R] Sample size Determination to Compare Three Independent Proportions

Dear All: good morning *Re:* Sample Size Determination to Compare Three Independent Proportions *Situation:* Three Binary variables (Yes, No) Three independent populations with fixed sizes (*say:* N1 = 1500, N2 = 900, N3 = 1350). Power = 0.80 How to choose the sample sizes to compare th