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2008 May 25
1
marginality principle / selecting the right type of SS for an interaction hypothesis
...no sense to report/interpret a main effect of
stereotype threat in the confirmed presence of the interaction effect
GENDER:STTHREAT, because a main effect of stereotype threat would
actually be caused by the interaction (an error-bar plot illustrating
this can be found here if one scrolls a little downwars:
http://myowelt.blogspot.com/2008/05/obtaining-same-anova-results-in-r-as-in.html)
. I thus tend to use Type-II SSs and calculate my ANOVA with
> library(car)
> Anova(lm(MWP ~ GENDER * STTHREAT), type="II")
Anova Table (Type II tests)
Response: MWP
Sum Sq Df...