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
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