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Fitting curves to curved decay rate and comparison thereof in minitab

Hi Folks,

Can anyone explain how to do the following in Minitab:

Want to fit a curve to a curved decay rate and then compare curves with something like analysis of covarience to see if them are the same or significantly different. Thought the curve would be an exponential decay but appears to be more cubic decay.

Lots of points on this one because I haven't a clue either about the answer or the question ;0)

Thanks,

Jes
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d-glitch
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SoggyP

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Hi Folks,

@d-glitch: Sorry, I can't post the data as it's for my wifes Phd (and she'd probably kick my butt if I did) and also for some reason minitab is the tool of choice so other application options aren't, um, options ;0)

Thanks for trying.

Later,

Jes
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Minitab has  online help and FAQ's.  It may help.  Here is the link:            http://www.minitab.com/support/answers/

I understand that you can't post preliminary, propriatary data.  

But could you post similar dummy data, or at least describe you real data?

For example:     20 sets of data.  Each set consists of 50 measurements of [population, concentration, temperature...] versus time.
Minitab also has  online tutorials that may cover the topics you need:       http://www.minitab.com/resources/tutorials/
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Hi Folks,

Well, my wife being a smartie (she'd have to be to understand all of the above) finally figured it out herself.  But you guys tried to help, so have some points.

Later,

Jes