topic Re: How does JMP construct confidence interval for spline fit in Graph Builder? in Discussions

How does JMP construct confidence interval for spline fit in Graph Builder?

shaira — Sun, 11 Jun 2023 11:13:17 GMT

I have a method to get the predicted Y from X value using Spline Fitting, but I want to quantify the confidence interval. I noticed it's not possible to do it in Bivariate plots but Graph builder can do this. How does Graph Builder to it (in terms of algorithm)? I want to do the same for bivariate plots fitted with spline fit.

Re: How does JMP construct confidence interval for spline fit in Graph Builder?

Phil_Kay — Wed, 28 Apr 2021 13:53:38 GMT

Hi,

I can't find much in the way of documentation on this. What I do know is that the confidence interval is constructed using bootstrap estimation. You should be able to find general information about bootstrap estimation.

Basically:

1. Create a bootstrap sample with replacement. That is, randomly draw rows of data. Each time you draw a row you make that row available in the next draw. Keep drawing until you have as many rows as in the original data. Some rows will be duplicated, triplicated, etc. Other rows will not be in the bootstrap sample.

2. Fit the smoother to the bootstrap sample.

3. Repeat steps 1 and 2 many times.

4. Construct the confidence interval such that it contains 95% of the smoother fits.

I hope that helps.

Phil

Re: How does JMP construct confidence interval for spline fit in Graph Builder?

shaira — Thu, 29 Apr 2021 00:39:23 GMT

Thanks Phil! I'll look into bootstrap sampling.

Re: How does JMP construct confidence interval for spline fit in Graph Builder?

winfriedkoch0 — Mon, 05 May 2025 10:10:48 GMT

Hi Phil,

Even in the current version of the documentation there seems to be no further explanation regarding the confidence of fit in JMP's Graph Builder.

Please provide at least a confimation that the confidence of fit could be considered as a 95%-confidence band around the Spline.

Best Regards

Winfried

Re: How does JMP construct confidence interval for spline fit in Graph Builder?

Phil_Kay — Tue, 06 May 2025 10:36:16 GMT

Hi @winfriedkoch0

Sorry, I'm not able confirm. Please contact JMP Technical Support (support@jmp.com) for any questions that you feel are not properly addressed in the documentation.

I hope that helps,

Phil

Re: How does JMP construct confidence interval for spline fit in Graph Builder?

hogi — Tue, 16 Dec 2025 21:43:15 GMT

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