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Aug 9, 2017 8:29 AM
(440 views)

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Aug 12, 2017 8:24 AM
(391 views)

Here's a graph of the data that might help someone else answer the question.

Craige

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Aug 14, 2017 5:04 AM
(375 views)

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Aug 14, 2017 6:01 AM
(371 views)

As you said, your initial attempts at empirical model building yield reasonable estimates of the inflection point. Given that the extremes of the response are asymptotes, I tried several logistic models. The logistic curve with five parameters exhibits the lowest AICc and provides for the asymmetric curve you requested.

If a theoretical model can be found and it is different from the choices in either the Fit Curve platform menu or the Model Library in the Nonlinear platform, then a custom model can be fit. See **Help** > **Books** > **Predictive and Specialized Modeling** > **Chapter 13: Nonlinear Regression**.

Learn it once, use it forever!

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Aug 14, 2017 6:08 AM
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Pete

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Aug 16, 2017 9:06 AM
(326 views)

By the way, there is an excellent short series of posts to the JMP Blog about fitting nonlinear models by Susan Walsh in JMP Technical Support. The link takes you to the last post, which contains links to the earlier posts in the series.

Very well done and very informative!

Learn it once, use it forever!

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