Between vs Within [General Sta­tis­tics]

posted by mittyri – Russia, 2024-10-05 02:08 (29 d 22:10 ago) – Posting: # 24216
Views: 912

(edited on 2024-10-05 22:59)

Hi Helmut & BEQool,

   anova1 <- anova(model1)

   num    <- as.numeric(anova1["group:treatment", c(3, 1)])

   denom  <- as.numeric(anova1["group:sequence:subject", c(3, 1)])


I really doubt that. In the article* referred there's a claim:

For the second and third comparisons, models 1 and 2 were used. Sex-by-formulation interactions were expressed by comparing the ratio of the test and reference geometric means for women with that for men. For sex-by-formulation interactions, observed ratio differences of greater than or equal to ±20 percentage points or statistically significant differences at P < .05 were used to identify interactions of interest.

It appears that the authors used the Residual Mean Squares (MS) as the denominator for the F-tests, rather than the Subject MS. This choice is not explicitly stated but seems likely based on the overall approach. Therefore, it's reasonable to assume that the interaction term Group*Formulation should also be tested against the Residual MS, not the Subject MS.



Kind regards,
Mittyri

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