Bioequivalence and Bioavailability Forum • Oops? One or two-tailed?

Oops? One or two-tailed? [General Statistics]

posted by ElMaestro – Denmark, 2012-09-14 17:48 (4681 d 05:47 ago) – Posting: # 9223
Views: 11,812

Hi Helmut and Detlew,

aren't both right? I am just thinking loud here:

We are talking about the critical value of the t distribution, and for that

We can base that on either one-tailed or two-tailed considerations, the t-dist is symmetric around 0.
There is no 'convention' just a bunch of papers and books.
Because of symmetry tval(1-alpha, df) = tval(1-alpha/2, df) if we are clear about the circumstances.

If I remember correctly MS Excel does it a little different from everyone else among the commonly used programs?

—
Pass or fail!
ElMaestro

Complete thread:

MSE calculation jag009 2012-09-13 17:39 [General Statistics]
- MSE calculation from CI of 3x3x3 study d_labes 2012-09-14 09:43
  - Oops! Helmut 2012-09-14 14:31
    - Oops? One or two-tailed?ElMaestro 2012-09-14 15:48
      - One or two-tailed? d_labes 2012-09-17 09:57
        
        One or two-tailed? Astea 2015-02-05 01:20
        
        Sample size, alpha, beta, beta/2 and that all d_labes 2015-02-05 09:31
        
        Sample size, alpha, beta, beta/2 and that all Astea 2015-02-07 12:53
        
        Sample size, alpha, beta, beta/2 and that all d_labes 2015-02-07 16:22
  - MSE calculation from CI of 3x3x3 study jag009 2012-09-24 20:12
    - MSE calculation from CI of 4x4x4 study d_labes 2012-09-25 10:40
      - MSE calculation from CI of 4x4x4 study jag009 2012-09-25 14:59
    - MSE calculation from CI of 3x3x3 study ElMaestro 2015-02-05 12:57

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