Data Analyst you can examine graphical information about the fit to your data,
including the residuals of the fit.
Data Analyst includes many features, such as error propagation and easy handling
of errors in both coordinates of the data, that statistics packages and spreadsheet
packages do not.
Data Analyst provides you with a rich environment for the visualization of your
experimental data, including histograms and box plots.
Experimental Data Analyst you can customize the behavior of the fitting
routines by selecting from numerous options--for example, you can choose the
basis function for fitting your data.