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Yes, main effect is separate from the interacted terms. Thanks for your time and effort.

But, if I do not put non-interacted dummies in the regression, I won't get the main effect of the variables. Please let me know -doesn't EViews show main effect and interaction effect together in case of dummy variables?

Workfile is here. I tried with different different options of commands, but got the error as I mentioned below. Please have a look: y_it c log_contribution @expand(x2,@dropfirst) @expand(x3,@dropfirst) @expand(x2,x3,@dropfirst) . with LS, I found: near singular matrix with Binary probit, I found: mu...

But least square shows 'near singular matrix'. I have found result when I did below: y c contribution @expand(x2,@dropfirst) @expand(x3,@dropfirst) or y c contribution @expand(x2,x3,@dropfirst) But when I tried y c contribution @expand(x2,@dropfirst) @expand(x3,@dropfirst) @expand(x2,x3,@dropfirst),...

Hello, I used below regression formula with Binary probit method to find out interaction: y c contribution @expand(x2,@dropfirst) @expand(x3,@dropfirst) @expand(x2,x3,@dropfirst) X2= female, male, X3= democratic, republican X4= challenger, incumbent, open. y= winning probability (binary dependent) B...