Kernel: SageMath 8.2
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/ext/sage/sage-8.2/local/lib/python2.7/site-packages/sage/repl/ipython_kernel/__main__.py:11: RankWarning: Polyfit may be poorly conditioned
D-9 Esitmation for 2010: 1.0185356829006386e+44
It appears that the D-9 polynomial is a bad fit because of the Runge phenomenon. A linear regression would be more appropriate.
In [0]: