st: Linear Regression

[Meric Osman <meo542@mail.usask.ca>]

Hi,
I have a problem about writing my regression equation. I want to add 
the variable and its square at the same time. Such as

y = a + a^2 + ...

Actually, I can do it by generating a new variable which is a*a, but I 
don't wanna do that because it is not an efficient way.

I really appreciate if you can help me with that.

Warm wishes

Meric Osman

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