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RegisterTreatment-by-Group in PROC MIXED and PROC GLM? [General Statistics]
Hi BEQool,
<IMHO>
Subject MS (nested within subgroup and sequence) is typically used to test other between-subject factors, like sequence or subgroup effects, not treatment-related effects. The subject MS usually captures variability between subjects but within their respective subgroups and sequences. Treatment-by-subgroup MS should generally be tested against the residual MS, because this residual error captures the variability within subjects that remains after accounting for treatment and subgroup effects.
If the subject MS is used as the denominator, this could lead to inflated F-values because the subject MS reflects between-subject variability, which is not appropriate for testing interactions involving the treatment effect
</IMHO>
yes
No preferences in exact dataset, but it would be good to test the dataset with unequal groups length
yes, if possible please
❝ ❝ […] So you should prove why you modified your ANOVA to get F against Subject MS. […]
❝ I mean if the Group*Treatment is a between-subject factor, it should be, in my opinion, tested by using Subject MS as the denominator.
<IMHO>
Subject MS (nested within subgroup and sequence) is typically used to test other between-subject factors, like sequence or subgroup effects, not treatment-related effects. The subject MS usually captures variability between subjects but within their respective subgroups and sequences. Treatment-by-subgroup MS should generally be tested against the residual MS, because this residual error captures the variability within subjects that remains after accounting for treatment and subgroup effects.
If the subject MS is used as the denominator, this could lead to inflated F-values because the subject MS reflects between-subject variability, which is not appropriate for testing interactions involving the treatment effect
</IMHO>
❝ As already discussed, you think that if they had used MS Subject as the denominator, they would have probably written it here?
yes
❝ Which dataset are you talking about? Some random dataset or a specific one?
No preferences in exact dataset, but it would be good to test the dataset with unequal groups length
❝ And you are talking about testing Group*Treatment interaction with this dataset with both PROC MIXED and PROC GLM and to see if there is any difference?
yes, if possible please
—
Kind regards,
Mittyri
Kind regards,
Mittyri
Complete thread:
- Group-by-Treatment Interaction: the final word? Helmut 2024-04-19 01:26 [General Statistics]
![[Mix]](https://static.bebac.at/img/mix.png "open in Mix view")
- Group-by-Treatment Interaction: FDA Helmut 2024-09-20 13:30
- Group-by-Treatment Interaction: the final word? BEQool 2024-10-03 15:09
- ANOVA of Model 1 Helmut 2024-10-03 15:33
- ANOVA of Model 1 BEQool 2024-10-03 16:08
- ANOVA of Model 1 Helmut 2024-10-04 10:11
- Between vs Within mittyri 2024-10-05 00:08
- Between vs Within BEQool 2024-10-06 20:06
- Treatment-by-Group in PROC MIXED and PROC GLM? mittyri 2024-10-06 22:00
- Treatment-by-Group in PROC MIXED and PROC GLM? BEQool 2024-10-07 10:27
- Treatment-by-Group in PROC MIXED and PROC GLM?mittyri 2024-10-07 13:11
- Treatment-by-Group in PROC MIXED and PROC GLM? BEQool 2024-10-14 11:01
- Treatment-by-Group in PROC MIXED and PROC GLM?mittyri 2024-10-07 13:11
- Treatment-by-Group in PROC MIXED and PROC GLM? BEQool 2024-10-07 10:27
- Treatment-by-Group in PROC MIXED and PROC GLM? mittyri 2024-10-06 22:00
- Between vs Within BEQool 2024-10-06 20:06
- Between vs Within mittyri 2024-10-05 00:08
- ANOVA of Model 1 Helmut 2024-10-04 10:11
- ANOVA of Model 1 BEQool 2024-10-03 16:08
- ANOVA of Model 1 Helmut 2024-10-03 15:33
Ing. Helmut Schütz