## curve estimation

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gonzo5
Posts: 4
Joined: Mon Aug 14, 2017 2:02 pm

### curve estimation

My data set has repeated answers to the question: "How likely are you to purchase this product at each price?" for a dozen different increments. So a dozen different columns. I'd like to test their answers against a quadratic model. And I'd also like to report the slope between each adjacent interval. When I use the Curve Estimation option, it asks for an independent variable or will generate a time variable, but these options don't fit the structure of my data. What's the best way to set this up using regression?
Thanks.
statman
Posts: 2760
Joined: Tue Jun 12, 2007 12:08 pm
Location: Florida, USA

### Re: curve estimation

Need a bit more and also ............
See the note below

Statman
Statistical Services
gonzo5
Posts: 4
Joined: Mon Aug 14, 2017 2:02 pm

### Re: curve estimation

Apologies...

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.

Thank you.

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