Re: [R] Sample size calculation proportions with EpiR: Discrepancy to other calculators

2009-06-02 Thread Karl Knoblick
ath.ethz.ch Gesendet: Dienstag, den 26. Mai 2009, 16:43:09 Uhr Betreff: Re: [R] Sample size calculation proportions with EpiR: Discrepancy to other calculators On Tue, 26 May 2009, Chuck Cleland wrote: > On 5/26/2009 2:53 AM, Karl Knoblick wrote: >> Hallo! >> >> I have done a sam

Re: [R] Sample size calculation proportions with EpiR: Discrepancy to other calculators

2009-05-26 Thread Thomas Lumley
On Tue, 26 May 2009, Chuck Cleland wrote: On 5/26/2009 2:53 AM, Karl Knoblick wrote: Hallo! I have done a sample size calculation for proportions with EpiR. The input is: treatment group rate p=0.65 control group rate p=0.50 significance level 0.95 power 0.80 two-sided ration group 1 and 2: 1.

Re: [R] Sample size calculation proportions with EpiR: Discrepancy to other calculators

2009-05-26 Thread Chuck Cleland
On 5/26/2009 2:53 AM, Karl Knoblick wrote: > Hallo! > > I have done a sample size calculation for proportions with EpiR. The input is: > treatment group rate p=0.65 > control group rate p=0.50 > significance level 0.95 > power 0.80 > two-sided > ration group 1 and 2: 1.0 > > I have done this in t

[R] Sample size calculation proportions with EpiR: Discrepancy to other calculators

2009-05-26 Thread Karl Knoblick
Hallo! I have done a sample size calculation for proportions with EpiR. The input is: treatment group rate p=0.65 control group rate p=0.50 significance level 0.95 power 0.80 two-sided ration group 1 and 2: 1.0 I have done this in the following way: library(epiR) epi.studysize(treat = 0.65, cont