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curvilinear relationship

Regression Models:How do you know you need a polynomial?

by Karen Grace-Martin  4 Comments

A polynomial term–a quadratic (squared) or cubic (cubed) term turns a linear regression model into a curve.  But because it is X that is squared or cubed, not the Beta coefficient, it still qualifies as a linear model.  This makes it a nice, straightforward way to model curves without having to model complicated non-linear models.

But how do you know if you need one–when a linear model isn’t the best model? [Read more…] about Regression Models:How do you know you need a polynomial?

Tagged With: curvilinear relationship, linear regression, polynomial regression, quadratic terms

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