The SPLINE method fits a cubic spline curve to the input values. A cubic spline is a segmented function consisting of third-degree (cubic) polynomial functions joined together so that the whole curve ...
Computational methods are presented for spline smoothing that make it practical to compute smoothing splines of degrees other than just the standard cubic case. Specifically, an order n algorithm is ...
indicates that the data are beginning-of-period values. OBSERVED=BEGINNING is the default. requests that the output series be the derivatives of the cubic spline curve fit to the input data by the ...
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