I have the following R output from a mixed factorial ANOVA:
Error: subj
Df Sum Sq Mean Sq F value Pr(>F) group
1 11.3 11.26 0.449 0.50811
singleType 1 0.7 0.66 0.026 0.87220 group:singleType
1 237.5 237.53 9.484 0.00461 **Residuals 28 701.3 25.04
---Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05
‘.’ 0.1 ‘ ’ 1
Error: subj:singleType
Df Sum Sq Mean Sq F value Pr(>F)
singleType 1 1566.4 1566.4 411.445 <2e-16 ***group:singleType
1 3.4 3.4 0.893 0.352 Residuals 30 114.2 3.8
---Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05
‘.’ 0.1 ‘ ’ 1
Error: Within
Df Sum Sq Mean Sq F value Pr(>F)Residuals 3286 5747 1.749
Here "group" is the between factor (2 levels) and "singleType" the within
factor (2 levels). I'm not sure why there are two group:singleType
interaction terms. Any help would be much appreciated!
For reference, here is the original aov call:
anova.p = aov(data = dat.colSingle, rt ~ (group*singleType) +
Error(subj/singleType))
summary(anova.p)
Thank you!
--
Angela Radulescu
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