EViews.com

I have created three dummy variables for my regression equation(they are in a GRACH model), after regressing, I have got z-statistics are all significant for the dummy variables, I want to know how can I carry out the t-test/ANOVA to tell if there is any difference among the groups related to three dummies please?

same problem here. can anyone help how to apply/or to explain the t test to see whether there is a different or not within 2 groups?