As of Version 6.0, StyleForm has been superseded by Style.
As of Version 6, SurfaceColor has been superseded by Specularity and Glow.
As of Version 7.0, FindDivisions has been added to the built-in Mathematica kernel.
Histogram
(Obsolete Histograms Package Symbol) As of Version 7.0, Histogram is part of the built-in Mathematica kernel.
As of Version 7.0, HistogramScale has been superseded by an optional argument hspec for the built-in Mathematica function Histogram.
BasisNames
(Obsolete Linear Regression Package Symbol) As of Version 7.0, BasisNames has become an optional argument for LinearModelFit.
The built-in function Fit finds a least-squares fit to a list of data as a linear combination of the specified basis functions. The functions Regress and DesignedRegress ...
The built-in function FindFit allows you to perform nonlinear least squares fitting. The function NonlinearRegress gives a number of regression diagnostics and allows you to ...
Ellipsoid
(Obsolete Regression Common Package Symbol) As of Version 7.0, Ellipsoid has been moved to the Multivariate Statistics package.
As of Version 7.0, RegressionReportValues has been superseded by LinearModelFit[...]["Properties"] and NonlinearModelFit[...]["Properties"].