For my bachelor thesis I have to calculate the sum of some betas (betas of x1, x2, and x3) of a linear regression model with fixed effects using SPSS 19 (STATA is only used in master degree). It is the following model:

y = x1 + x2 + ... + x6 + time dummies + fixed bank effects

y is revenue, where x1 - x3 are costs, and x4 - x6 are included to control.

But I cannot introduce fixed bank effects by creating new dummies, since this would take too much time (the data sets require at least 150 dummies, one for each bank name).

I figured out that fixed effects can be included using(Analyze-->Mixed models), but I wonder what I've to include under Subjects/Repeated, etc.

The only output I get is output without a full regression equation.

Can anyone help?

Thanks in advance!