Hello All,
I have a question regarding interaction terms with multiple regression using
happenstance data.
I have created interaction columns by multiplying to independent factors
together. When I run the regression, the interaction effect comes out
significant (p-value .002) but both of the main factors were not.
My question is if I must include the main effect terms if I am going to keep
the interaction term in the model?
Example:
Factor A Pvalue of .400
Factor B Pvalue of .062
Factor AB Pvalue of .002
Do I need to keep factor 1 in the regression model?
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