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Marginal Means
The mean scores from all participants at one level of the IV
SSa
The extent to which the marginal means of A vary
SSb
The extent to which the marginal means of B vary
dfa
a-1
dfb
b-1
dfaxb
(a-1)(b-1)
To get dfaxb you
Multiply dfa and dfb
dfwithin
N-ab
dftotal
N-1
SStotal
SSa + SSb + SSaxb + SSwithin
You have a main effect if
The marginal means are different
Interaction
One line decreases, the other increases
DV is always on
The y axis
The average refers to
The marginal mean
MSa Formula

MSb Formula

MSaxb Formula

Fa Formula

Fb Formula

Faxb Formula
