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i've been trying to find a better fit for a correlation, the numbers i'm dealing with are really small and when i try to solve for the coefficients using the inverse function on the matrices in Matlab i get this error:

Warning: Matrix is close to singular or badly scaled. Results

may be inaccurate. RCOND = 5.541639e-25.

I tried solving the inverted matrix in excel and the results didn't make much sense either! is there an other way to solve this problem? I really can't solve it by hand it'll take me ages.

i'm open to any suggestion...

J.