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Winzer
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Homework Statement
I was given a set of data from a Ion engine experiment. I fitted the data with an 8th order polynomial that seems pretty reasonable. What I want is the uncertainty in the coefficients.
One way I read was through the design matrix.
Homework Equations
[tex] C_{ij}=(A^T A)^{-1} [/tex]
The Attempt at a Solution
The square root of the diagonals give the uncertainties. But my matrix in not invertible since its not square.
What am I missing?