33.0 MARS Command has been replaced.                                           
                                                                                
     The MARS option that performed estimation of Multivariate Adaptive     
Regression Splines following methods suggested by J. Friedman using code        
developed by Friedman(1991) has been replaced.
                                             
The Hastie-Tibshirani MARS Code, first implemented in S in 1998         
and later ported and made GPL compliant, has been implemented as the          
MARSPLINE command under the b34s matrix command. The Hastie-Tibshirani          
routines were developed without the Friedman MARS routines. These               
routines have the ability to model higher dimension models than the             
older (1991) Friedman code and in the opinion of the developer of B34S          
represent a state of the art mars model implementation.                         
                                                                                
                                                                                
Basic references for MARS are:                                                           
                         

     - Faraway, Julian. "Extending the Linear Model with R" 2006, New 
       York: Chapman & Hall/CRC

     - Hastie, T., R. Tibshirani and J. Friedman "The Elements of
       Statistical Learning: Data Mining, Inference, and Prediction."
       2001 New York: Springer.
                                                       
     - Friedman, Jerome, "Multivariate Adaptive Regression Splines," The        
       Annals of Statistics, Vol. 19, No. 1, 1991, pp. 1-141                    
                                                                                
     - Stokes, Houston H. "Specifying and Diagnostically Testing                
       Econometric Models," second edition 1997  Quorum Books.                  
       Chapter 14                                                               
                                                                                
     - Stokes, Houston H and Hugh Neuburger, "New Methods in Financial          
       Modeling," 1998 Quorum Books. Chapter 4.                                 
                                                                                
     - Stokes, Houston H. "MARS Modeling in SASŪ Software Using the             
       MACRO Interface to B34SŪ," Proceedings of the Twenty-First               
       Annual SASŪ Users Group  International Conference, 1996 pp.              
       1145-1149.