Can I drop the interaction term from the model if the interaction term is insignificant?
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If the purpose of your analysis is to say something about the interaction term, then it is more convincing to keep the interaction in and show that it is not significant.
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$\begingroup$ And by keeping it you will preserve type I error and unbiasedness of the estimate of residual variance. $\endgroup$ Nov 25, 2014 at 13:09