topic CV, GCV & smoothing parameter (alpha) in p-spline? in Discussions

CV, GCV & smoothing parameter (alpha) in p-spline?

Raaed — Mon, 23 Sep 2019 19:23:32 GMT

Hi everyone

please; how to calculate CV, GCV & smoothing parameter (alpha)

in penalized spline regression?

regards;

Re: CV, GCV & smoothing parameter (alpha) in p-spline?

Mark_Bailey — Mon, 23 Sep 2019 19:57:25 GMT

If you are referring to the P-spline models in the Functional Data Explorer, they are related to the multiple adaptive regressions splines. The GCV and penalty are described on that page.

See also JMP > Books > Predictive and Specialized Modeling > Functional Data Explorer.

Re: CV, GCV & smoothing parameter (alpha) in p-spline?

Raaed — Tue, 24 Sep 2019 09:10:19 GMT

Dear sir:
in the below shortcut, how to obtain of GCV and Smoothing parameter (with bandwidth auto-selected)
please, if you can help me.

I can do this in SAS & R (but I can't in Jmp pro 14.3).

best regards

Re: CV, GCV & smoothing parameter (alpha) in p-spline?

Raaed — Tue, 24 Sep 2019 11:55:12 GMT

Re: CV, GCV & smoothing parameter (alpha) in p-spline?

Mark_Bailey — Tue, 24 Sep 2019 11:35:24 GMT

First of all, splines model continuous data. Your response is obviously dichotomous, so you should use a method based on the binomial distribution such as logistic regression or the generalized linear model.

The measures that you asked about (e.g., GCV) are not available in the Bivariate platform. They are not available from Fit Least Squares either.