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Nonlinear Fit ... Errors and covariance.


I am trying to use NonlinearFit to fit some data.  Is there any
way of getting the covariance matrix and Chi squared.  I prefer
to to run the notebook with the ShowProgress->False, because I
have a large number of data sets and I am running it in a Do
loop and dont want to scroll through large amounts of text.
The old version of NonlinearFit seemed to have
Sigmaparameters.  Is there anyway of getting that in the new




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