[R] Find main effect in 2-way ANOVA

[Gao Fay]

Hi,

I use anova() to find interaction effect and then I need to find data with 
main effect from those data with interaction effect. How to do that?

I used : anova(lm(data~factor1*factor2)), then select data with interaction 
effect. Then I need to select those data also with main effect of factor1 
or factor2, from previous selected data. How to do that? Many thanks for 
your time on my quesiton!

Fay