Regression

*To*: mathgroup at smc.vnet.net*Subject*: [mg73835] [mg73835] Regression*From*: Anurag <anurag_uor at yahoo.com>*Date*: Fri, 2 Mar 2007 06:17:30 -0500 (EST)

Hi, I am doing regression using mathematica. The code is simple. I define a polynomial. Read the data points from a file. I make sure that there are 27 data points in the file and all the 27 data points are unique. polynomial = Flatten[Table[x^i y^j z^k, {i, 0, 2}, {j, 0, 2}, {k, 0, 2}]]; dataf = ReadList["C:\\Debug\\ForRegression.txt", Number, RecordLists -> True]; datafromfile = Transpose[dataf]; RegResult = Regress[dataf, polynomial, {x, y, z}] I am getting error "Regress::mindata: The number of parameters to be estimated is greater than or equal to the number of data points. Subsequent results may be misleading. DesignedRegress::rank: Warning: the rank of the design matrix is 25, less \ than full rank 27. Only 25 of the 27 basis functions are needed to provide \ this fit. Try using a different model or greater precision." Kindly help me fix the problem ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com