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- slopes from two different regression curves for equivalency?

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Jan 20, 2015 6:41 AM
(1483 views)

Can someone please provide direction on how to compare two different slopes from two different regression curves for equivalency? I have data sets with one response (call it activity) and the main effect being time. I have another effect, manufacturer (currently as Character/Nominal values) that I want to include to see if there's any difference in the two different regression curves as a result of different manufacuturers. I'm using Jmp Ver 8.0.2. Hope someone can help me.

2 REPLIES

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Jan 20, 2015 2:05 PM
(1275 views)

Have one data table, structured similar to this:

Activity Time Manufacturer

9 0 A

8.7 0 B

8.3 1 B

9.2 2 A

....

Fit a Model in JMP with Y = Activity and the following terms: Time, Manufacturer, Time*Manufacturer.

In the report, if Manufacturer is significant, that tells you that the intercept for the time models are different. If the Time*Manufacturer term is significant then that tells you that the time slopes are different. I am guessing this is what is needed. You did however state EQUIVALENCY. If you need EQUIVALENCY, the process is more complicated. I hope this is what you really needed.

Dan Obermiller

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Jan 21, 2015 5:59 AM
(1275 views)

Thnaks DanO. Correct answer (I forgot about the cross function for factors...it's been a while)