Bioequivalence and Bioavailability Forum

SAS PROC GLM with group effect [General Statistics]

posted by ElMaestro – Denmark, 2014-05-19 13:51 (4052 d 19:02 ago) – Posting: # 12968
Views: 15,632

Hello Sliva,

❝ For a regular 2x2x2 study performed with two dosing days groups, I've wrote the following code on SAS:

(...)

❝ On the output for the group effect, degrees of freedom were calculated as 0 and type I SS and type III SS were calculated as 0.00000000. For formulation*group effect, DF were computed as 1 and p_value as 0.7228 (for both type I and III SS).

❝ Am I doing something wrong on SAS? Can you comment please! I'm very rookie with this software!

It may very well be correct. In your setup subject is nested in sequence which is nested in group. So you could instead speak of "Subject(Sequence x Group)" etc.
The SS=0.0000000 is due to the fact that no additional columns for the group effect (a between-subject factor) can be forced into the design matrix.

No idea how to interpret or use Treatment x Group if that combo had been significant. If you have some thoughts on that I'd be happy to hear your ideas.

—
Pass or fail!
ElMaestro

Complete thread:

SAS PROC GLM with group effect Silva 2014-05-19 10:57 [General Statistics]
- SAS PROC GLM with group effectElMaestro 2014-05-19 11:51
  - SAS PROC GLM with group effect Silva 2014-05-22 12:01
    - SAS PROC GLM with group effect d_labes 2014-05-22 14:11
      - SAS PROC GLM with group effect Silva 2014-05-22 16:54
- SAS PROC GLM with group effect d_labes 2014-05-19 13:02
- SAS PROC GLM with group effect Silva 2014-05-23 12:12
  - SAS PROC GLM with group effect ElMaestro 2014-05-23 12:31
  - Acceptability of software Helmut 2014-05-23 12:47
    - Acceptability of software Lucas 2014-11-14 12:21
      - Acceptability of software Helmut 2014-11-14 14:11

SAS PROC GLM with group effect [General Sta­tis­tics]

Complete thread:

SAS PROC GLM with group effect [General Statistics]