NAN values of coefficients for miltiple linear regression using regress function

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Priya
Priya am 18 Sep. 2013
I have 5 data sets of size less than 10 values.(Y-variable)
When I performing multiple linear regression upto three combinations of descriptors (X-variables), I get correlation coefficient to be 1, but the coefficient values are NAN..
What does that mean ?

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