Question: NonlinearFit Error

Hi everybody, I’m Helena

I have a function with the following general characteristics:

y= const*M*[Int_def (from a to b) [f(x)*g(x, M)*p(x, t, M,K)]dx]

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y= dependent variable

a= 1.76E-7

b= 1.76E-9

x= integration variable

M= unknown parameter

K= unknown parameter

t= independent variable

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... and I'm trying to fit it to my experimental data (421 values), to determine the best values for M and K. In order to do that I’m using the package Statistic and the NonlinearFit command from maple, however, it seems that NonlinearFit cannot fit the model (y(t)) to the experimental data. It gives an error: “Error, (in Statistics:-NonlinearFit) integration range or variable must be specified in the second argument, got HFloat(1.0) = 0 .. 1” for which I could not find any explanation or solution on the internet. Could you please give me some advice or ideas about how can I solve this problem?

Thank you so much in advance for your attention and help.