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Creating polynomial expansion of a variable
Creating polynomial expansion of a variable

Dear Statalist,

What I want to do is to create a polynomial expansion of a certain degree of two variables k and i in such a way to approximate an unknown function g(k,i). Is there a function in Stata? Doing that manually is quite time consuming and it is dangerous since you can forget some terms easily.

Manually it is (for a polynomia of degree 4): gen phi= i+i*k+i*k*k+i*k*k*k + i*i+ +i*i*k*k+i*i*k+i*i*i+i*i*i*k+k*k*k*k+i*i*i*i

Thank you for your help,

Gino

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