What is an objective function?
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One that provides a quantitative assessment of how well the curve fits the data.
What method of curve fitting is used by polyfit?
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Linear regression.
What does curve fitting do?
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Relates an independent variable to an estimated value of a dependent variable.
What is the coefficient of determination?
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Coefficient of determination, R^2, is equal to 1 – (estimated error)/(variance of the actual data)