loading NonlinearModelFit in Mathematica 6

Questions
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1

Hello, I’m new to the community but see that you provide great guidance so I have a question to ask:

How do I load NonlinearModelFit in Mathematica 6?

When I try using the function as is documented on line I get:

data={{0,1},{1,0},{3,2},{5,4},{6,4},{7,5}};
nlm=NonlinearModelFit[data, Log[a + bx^2],{a,b},x]
NonlinearModelFit[{{0,1},{1,0},{3,2},{5,4},{6,4},{7,5}},Log[a+bx2],{a,b},x]

Thanks,
Mark

2

From the documentation for NonlinearModelFit, http://reference.wolfram.com/language/ref/NonlinearModelFit.html one can see that it was first introduced in Mathematica version 7 (that information is at the bottom of the page).

3

Thanks David,- great answer.

I use Mathematica to simulate pharmacokinetics and pharmacodynamics. These problems are described by a series of ODEs which NDSolve does a great job of solving - once I’ve chosen the values of the parameters.

Moving forward, I was wondering if I could use Mathematica (6.0) to take a data set and optimize the parameters in my model ODEs to give a best fit to the study data.

If this can be more easily done in the latest edition of Mathematica I am open to upgrading.

Thanks again for your time,
Mark

4

You could use FindMinimum to do the fitting. It’s been in Mathematica since Version 1.