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Y-intercept with Dummy Variables?

Posted: Mon Jun 01, 2015 6:03 pm
by Apple Tan
Hi

I have got 2 equations (See attachment).

A) Basically, I just want to know what is the difference of a
1) model with the variable "trend" interacting with my dummy variables (Eqn 2)
2) model with the variable "trend" alone (Eqn 1)

B) How do I check which is a better model?

Thank you