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nonlinear fit question


I am trying to do a nonlinear fit using a model I have developed.  My  
problem is that my model is discontinuous and I only want to allow  
the NonlinearFit function to search a range for the value of one of  
the parameters. The actual implementation would be something like:

NonlinearFit[data,Model[xVar,yParam],xVar,yParam]

but I want yParam to be confined to a range as: ymin <= yParam <= ymax

I tried using NonlinearFit[data,Model[xVar,yParam],xVar,{yParam, 
{ymin,ymax}}] but the function is obviously searching outside this  
range.  I know there is a good fit in the range that I am specifying,  
so I don't know why it insists on searching outside the start  
values.  Is there a way to confine my yParam?

Any help is greatly appreciated.

Kevin Towles


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