OS: Windows 10
SPSS version: 23
Additional study info: I want to know how well my participants' ratings fit a quadratic function. Each participant rated their likelihood of purchasing the same product at 12 different price points. The price points increase by a constant amount, starting from zero. I'd also like to know the rate of change (slope) between each adjacent interval.
Data info: Each row represents a different respondent. Each column represents a participant's response to a different price point in ascending order.
What I did so far: I think this can be addressed using regression, so I clicked on Analyze / Regression / Curve Estimation
If that's the correct test, then I see that it asks for independent variables, but I don't have a dummy coded independent variable because my data are repeated measures. I also didn't code time. So I'm not sure what kind of data structure this test expects.