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Thank you!

I have a series y and want to regress it like an AR(x) model. I can type "ls y AR(1) AR(2)... AR(x)" but in programming can I do something like "ls y AR(1:x)"? This specific notation does not work. I hope it is clear what I want to do. I now have: vector(20) hs equation eq for !i...

Is this code correct?, it does not agree with MatLab.

Thank you :-)

I want to find the polynomial corresponding to given roots, (in order to create a stationary ARMA process).
In MatLab I know you can type poly(x) and this gives you the coefficients of the characteristic polynomial with roots x.
Please help!