Polynomial regression with covariates in SPSS: Identifying and describing a quadratic relationship

In this video, I walk you through an approach for identifying and describing a quadratic functional relationship between a focal independent variable and the dependent variable in a linear regression that includes covariates. I discuss identification of non-linearity using residuals plots and an approach for graphing a quadratic functional relationship between the IV and DV while holding the covariates constant at their means.
The example is based around a discussion in Chapter 12 of Darlington & Hayes (2017) book: www.afhayes.co...
Download a copy of the data used in the video here: drive.google.c...
Supplemental powerpoint: drive.google.c...

[@lawrancetsoi2093]

Hi Prof Mike, thank you so much for your video!! It is very clear to me and helps me a lot! By the way, may I invite you to record a video about surface response analysis of quadratic relationships? This technique seems so popular these days. Thank you very much!