Results 31 to 40 of about 9,653,321 (312)

Semi-Parametric Joint Modeling of Survival and Longitudinal Data: The R Package JSM

open access: yesJournal of Statistical Software, 2020
This paper is devoted to the R package JSM which performs joint statistical modeling of survival and longitudinal data. In biomedical studies it has been increasingly common to collect both baseline and longitudinal covariates along with a possibly ...
Cong Xu   +2 more
doaj   +1 more source

A Higher Order B-Splines 1-D Finite Element Analysis of Lossy Dispersive Inhomogeneous Planar Layers [PDF]

open access: yesAUT Journal of Electrical Engineering, 2017
In this paper we propose an accurate and fast numerical method to obtain scattering fields from lossy dispersive inhomogeneous planar layers for both TE and TM polarizations. A new method is introduced to analyze lossy Inhomogeneous Planar Layers.
A. Hatamkhani, A. Ghorbani
doaj   +1 more source

D-splines: Estimating rate schedules using high-dimensional splines with empirical demographic penalties

open access: yesDemographic Research, 2021
Background: High-dimensional parametric models with penalized likelihood functions strike a good balance between bias and variance for estimating continuous age schedules from large samples. The penalized spline (P-spline) approach is particularly useful
Carl Schmertmann
doaj   +1 more source

Boosting Additive Models using Component-wise P-Splines [PDF]

open access: yes, 2007
We consider an efficient approximation of Bühlmann & Yu’s L2Boosting algorithm with component-wise smoothing splines. Smoothing spline base-learners are replaced by P-spline base-learners which yield similar prediction errors but are more advantageous ...
Hothorn, Torsten, Schmid, Matthias
core   +1 more source

Optimizing freeform lenses for extended sources with algorithmic differentiable ray tracing and truncated hierarchical B-splines

open access: yes, 2023
We propose a method for optimizing the geometry of a freeform lens to redirect the light emitted from an extended source into a desired irradiance distribution.
Alexander Heemels (14679481)   +3 more
core   +1 more source

FREE DEFORMATION OF MULTIRESOLUTION B-SPLINES CURVES

open access: yesPesquimat, 2014
When a point oí the curve is dragged to another position, a local curve segment ís affected, whose size could be determined by propagating the deformation on lower resolution of the curve in multiresolution representation.
Luis A Rivera   +2 more
doaj   +1 more source

Visual Flight Rules-Based Collision Avoidance Systems for UAV Flying in Civil Aerospace

open access: yesRobotics, 2020
The operation of Unmanned Aerial Vehicles (UAVs) in civil airspace is restricted by the aviation authorities, which require full compliance with regulations that apply for manned aircraft.
Hamid Alturbeh, James F. Whidborne
doaj   +1 more source

Monotonic regression based on Bayesian P-splines: an application to estimating price response functions from store-level scanner data [PDF]

open access: yes, 2003
Generalized additive models have become a widely used instrument for flexible regression analysis. In many practical situations, however, it is desirable to restrict the flexibility of nonparametric estimation in order to accommodate a presumed monotonic
Steiner, Winfried J., Brezger, Andreas
core   +1 more source

Kernel B-splines and interpolation

open access: yesNumerical Algorithms, 2006
Kernel B-splines comprise a more general approach to radial basis function interpolation, in that the more specific radial basis functions are replaced by positive definite kernels or conditionally positive kernels. In this paper, differences are applied to the conditionally positive definite kernels in order that they decay (more quickly) and that the
Bozzini M, Lenarduzzi L, Schaback R
openaire   +5 more sources

Spline Trajectory Planning for Road-Like Path with Piecewise Linear Boundaries Allowing Double Corner Points

open access: yesSICE Journal of Control, Measurement, and System Integration, 2018
We consider a problem of trajectory planning for road-like path on the two-dimensional plane. As the basic tool for constructing trajectories, we employ smoothing splines using normalized uniform B-splines as the basis functions.
Hiroyuki Kano, Hiroyuki Fujioka
doaj   +1 more source

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