topic Re: Comparing the slope of a exponential 3P model. in Discussions

Comparing the slope of a exponential 3P model.

Marcoz — Wed, 28 Feb 2024 18:23:00 GMT

Hi, I am trying to compare three exponential 3P curves for my stability study. Is there a way in JMP where I can do this such as Parallelism test?

Re: Comparing the slope of a exponential 3P model.

Mark_Bailey — Wed, 28 Feb 2024 21:24:10 GMT

Have you tried the approaches described in the documentation?

Re: Comparing the slope of a exponential 3P model.

Marcoz — Mon, 04 Mar 2024 16:25:43 GMT

Hi Mark,

Yes, I did that but there is no parallelism test option available for me. I am using JMP 16.1.

I have include a JMP file for the current situation I have. Please note that I have remove some information due to confidentiality.

Re: Comparing the slope of a exponential 3P model.

Mark_Bailey — Mon, 04 Mar 2024 16:40:40 GMT

This data appears to be from a stability study. Here is a plot of the data you provided:

It exhibits a linear degradation path. There seems to be a data anomaly on day 7 for all lots. A logistic model is not suitable for this case.

Re: Comparing the slope of a exponential 3P model.

Marcoz — Mon, 04 Mar 2024 18:18:22 GMT

Yes, you are correct that it is a stability curve. Do you have a recommendation I can work on so that I can perform a parallelism test?

Re: Comparing the slope of a exponential 3P model.

Mark_Bailey — Mon, 04 Mar 2024 18:38:27 GMT

Please see the chapter for the Degradation platform for general background information and orientation. There is a section near the end about stability analysis.

Re: Comparing the slope of a exponential 3P model.

Marcoz — Mon, 04 Mar 2024 20:43:57 GMT

Thank you so much.