## AND or OR, that’s the question [Power / Sample Size]

Hi Helmut,

Thanks again for this explanation.

After some thoughts, I am wondering if the sample size estimation only considers one comparison. I found an old following post regarding this topic.

If we are considering both T1=R and T2=R, perhaps, we need to look at the bivariate distribution of the two test statistics when looking at the power. And these should be correlated as well, which makes things complicated. I am maybe missing something and was wondering if you could enlighten me on this subject.

Thank you sincerely!

Thanks again for this explanation.

After some thoughts, I am wondering if the sample size estimation only considers one comparison. I found an old following post regarding this topic.

If we are considering both T1=R and T2=R, perhaps, we need to look at the bivariate distribution of the two test statistics when looking at the power. And these should be correlated as well, which makes things complicated. I am maybe missing something and was wondering if you could enlighten me on this subject.

Thank you sincerely!

### Complete thread:

- Sample size for 3-way crossover chrisk 2022-08-09 18:55 [Power / Sample Size]
- Sample size for 3-way crossover Helmut 2022-08-10 11:30
- Sample size for 3-way crossover chrisk 2022-08-10 15:24
- AND or OR, that’s the question Helmut 2022-08-10 15:58
- AND or OR, that’s the question chrisk 2022-08-10 17:46
- AND or OR, that’s the question Helmut 2022-08-10 20:59
- AND or OR, that’s the questionchrisk 2022-08-10 22:00
- AND or OR, that’s the question Helmut 2022-08-11 15:25
- AND or OR, that’s the question chrisk 2022-08-12 16:02
- The unknown ρ Helmut 2022-08-17 15:04

- AND or OR, that’s the question chrisk 2022-08-12 16:02

- AND or OR, that’s the question Helmut 2022-08-11 15:25

- AND or OR, that’s the questionchrisk 2022-08-10 22:00

- AND or OR, that’s the question Helmut 2022-08-10 20:59

- AND or OR, that’s the question chrisk 2022-08-10 17:46

- AND or OR, that’s the question Helmut 2022-08-10 15:58

- Sample size for 3-way crossover chrisk 2022-08-10 15:24

- Sample size for 3-way crossover Helmut 2022-08-10 11:30