Spline theory and piecewise regression theory are integrated to provide a framework in which structural change is viewed as occurring in a smooth fashion. Specifically, structural change occurs at ...

The unknown monotone regression function is approximated by a cubic spline and the constraints are represented by the intersection of quadratic cones. We treat the number and locations of knots as ...

Objective: The objective of this study was to develop a new 2-regression model relating Actical activity counts to METs. Methods: Forty-eight participants (mean (SD) age 35 (11.4) years) performed 10 ...

Cubic regression was performed with an assumption that during 1996–1999, overtime, injury rate may increase then decrease or vice versa.