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This is a short answer question. Give points/results. We fit a piecewise polynomial for a regression, selecting 3 cut-points in our data - how many

This is a short answer question. Give points/results.

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We fit a piecewise polynomial for a regression, selecting 3 cut-points in our data - how many constraints need to be introduced at each cut-point to obtain a cubic spline? Explain each constraint. What would be the total degrees-of- freedom for the curve

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