Interaction in linear regression

[Akif Alig]

I have a question regarding interaction in linear regression:

For example, I have run a regression between BMI and education.

Then I want to examine the interaction between education and sex in predicting BMI

So I put an interaction term i.sex##c.education in the model

My question is whether this term gives us additive interaction or multiplicative interaction

If it gives multiplicative interaction, then how can we calculate additive interaction?


Thank you in advance

[Carlo Lazzaro]

Akif:
see https://stats.stackexchange.com/ques...action-differs

[Akif Alig]

Thank you Carlo