topic How can I get the predicted R2 with JMP ? in Discussions

How can I get the predicted R2 with JMP ?

Cedrick1 — Mon, 05 Aug 2024 15:45:46 GMT

Comment puis-je obtenir le R2 prévu avec JMP ?
J’ai réalisé un design de surface de réponse avec trois facteurs. J’ai obtenu le R2 ajusté et j’aurais besoin du R2 prédit pour valider mon expérience.

Re: How can I get the predicted R2 with JMP ?

shampton82 — Mon, 05 Aug 2024 15:53:37 GMT

Hey @Cedrick1 I believe this is what you are looking for

Steve

Re: How can I get the predicted R2 with JMP ?

statman — Fri, 09 Aug 2024 15:47:03 GMT

First, R^2 does not validate your experiment. It is one estimate to help you evaluate your model. The better use of R^2 is to compare the R^2 to the Adjusted R^2 to see if you have over-specified the model. The only time I have seen predicted R^2 is with Minitab. Minitab takes a random sample from the data set and uses the model you have entered to calculate how much of the variation in that data is explained by the model.

"Predicted R ² is calculated with a formula that is equivalent to systematically removing each observation from the data set, estimating the regression equation, and determining how well the model predicts the removed observation."

Whether this is actually useful ...?

There are many ways to "hold out" some data from a data set (e.g., boot strapping, nearest neighbor). Use the rest of the data to estimate the model and then test the model with the data that was held out. Is this what you are asking?

Re: How can I get the predicted R2 with JMP ?

Cedrick1 — Fri, 09 Aug 2024 10:15:05 GMT

Thank you very much for your reply.
I would also like to know please the different parameters to be taken into account for the interpretation and validation of the results after performing a three-factor response surface design and how to obtain them with JMP?

I would like to point out that I am a young user of experimental design and JMP.