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MGR ★ India, 2015-11-13 08:43 (3454 d 08:43 ago) Posting: # 15634 Views: 7,356 |
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Hi all, How to calculate Inter CV of a parallel study from the values of Confidence interval, Ratio and N? For Example: CI lower = 0.876 CI Upper = 1.02 Ratio = 0.96 N = 122 The above results are from a Parallel study. Please suggest how to calculate the Inter CV from the above data. Thanks in advance, — Regards, MGR |
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d_labes ★★★ Berlin, Germany, 2015-11-13 12:13 (3454 d 05:13 ago) @ MGR Posting: # 15635 Views: 5,859 |
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Dear MGR, it is only possible to get the total (inter+intra) CV from a parallel group study. With this in mind and assuming 90% CI you can do in the software R  :library(PowerTOST)gives you a CV = 0.258 (25.8%). If you don't have R you can do the algebra behind by hand. It's not so hard. See Helmut's lectures about "sample size estimation". Change degrees of freedom and design constant according to the parallel group design. Better install R, it's free. And use the "gold standard" package PowerTOST  .— Regards, Detlew |
Ing. Helmut Schütz