Getting a curve to fit my points

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The discussion centers around the challenge of fitting a curve to a dataset while considering specific constraints, particularly the maximum and minimum Y-values. The user has experimented with various software options, including Gnumeric, Openoffice.org, and XMGrace, noting that Gnumeric was user-friendly but limited in features, Openoffice.org failed to provide an adequate fit, and XMGrace did not accommodate the maximum Y-value as a constraint. There is a suggestion to consider whether the data is linear or non-linear and to critically evaluate the fit of the curve, including the potential use of the Chi Squared method for assessing fit quality. The conversation emphasizes the importance of exploring different fitting techniques and tools to achieve an optimal curve fitting solution.
Genecks
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So, I have a table of data, and I'm trying to get a curve to fit the points.
I haven't tried excel yet, but I have tried these things:
1) Openoffice.org
2) Gnumeric
3) XMGrace

- Gnumeric was straight-forward, but lacked many abilities.
- Openoffice.org couldn't fit the curve well enough
- And XMGrace wouldn't consider the maximum Y-value as a graphing constraint.

So, I'm trying to figure out this:
How do I fit a decent curve to my graph while having the curve feature take consideration of the maximum and minimum y-values?

Take a look at this for more information:
http://www.oooforum.org/forum/viewtopic.phtml?t=88559
 
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Are you trying to fit to linear or non-linear data? Also, don't assume a good fit simply by looking at the results. Always ask yourself, could there be a better fit than mine? Lastly, are you familiar with the Chi Squared method?

Thanks
Matt
 

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