As of Version 7.0, ParameterCITable has been renamed "ParameterConfidenceIntervalTable" and become a property of LinearModelFit and NonlinearModelFit.
As of Version 7.0, ParameterConfidenceRegion has become a property of LinearModelFit and NonlinearModelFit.
As of Version 7.0, ParameterTable has become a property of LinearModelFit.
As of Version 7.0, PartialSumOfSquares has become a property of LinearModelFit.
As of Version 7.0, PredictedResponseDelta has been renamed to "FitDifferences" and has become a property of LinearModelFit.
As of Version 7.0, PredictedResponse has become a property of LinearModelFit and NonlinearModelFit.
As of Version 7.0, RegressionReport has been superseded by properties of LinearModelFit and NonlinearModelFit.
As of Version 7.0, RegressionReportValues has been superseded by LinearModelFit[...]["Properties"] and NonlinearModelFit[...]["Properties"].
RSquared
(Obsolete Regression Common Package Symbol) As of Version 7.0, RSquared has become a property of LinearModelFit.
As of Version 7.0, SequentialSumOfSquares has become a property of LinearModelFit.