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 version.