Fitting Multiple Curves With Multiple Functions

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Sun, 11/09/2008 - 08:42 pm

Here's my problem in principle:

I wish to fit one set of data Energy(x) with the equation a*x+b. At the same time I wish to fit a completely different set of data Charge(x) with the curve a*x^2+b, where a and b are the same in both fits. Is Igor able to fit both of these curves simultaneously by minimizing the summed error from each fit?

Thanks
Sure. Check out "Global Fit" (one of the packages at the bottom of the Analysis menu). Note that to get meaningful results, you'll need to know the standard deviation of errors for both data sets.

November 9, 2008 at 10:03 pm - Permalink