This video provides a conceptual and practical overview of polynomial regression using SPSS. I begin with a demonstration using simple linear regression where the assumed functional form between the independent and dependent variable is linear. Next, I demonstrate an approach to graphing data to better visualize non-linearity in your data. I then demonstrate how to use hierarchical regression in order to select the best fitting (and hopefully most parsimonious) model. Finally, I demonstrate an alternate approach using the Curve Estimation function in SPSS.
A copy of the SPSS data used in this video can be downloaded here:
https://drive.google.com/file/d/1HSTK57LlacuOCCKgZzKcK4-yQ9GWX2ch/
Supplemental powerpoint with models:
https://drive.google.com/file/d/1odxkEj4Xb7F2tgn6-ZO-QWxegbIBQR4z/