Results 111 to 120 of about 1,769,588 (220)

Penalized Likelihood‐Based Estimation of Stratified Semiparametric Cox Models Under Partly Interval Censoring

Biometrical Journal, Volume 68, Issue 5, October 2026.
ABSTRACT In survival data analysis, the stratified Cox model becomes a popular option when the proportional hazards assumption of the conventional Cox model does not hold for certain covariates. For a stratified Cox model, when the observed survival times contain only right censoring, the method of maximum partial likelihood can still be implemented ...
Jun Ma, Annabel Webb, Maurizio Manuguerra, H. Malcolm Hudson   +3 more
wiley   +1 more source

Interlacing inequalities for totally nonnegative matrices

, 2008
Dedicated to Professor T. Ando on the occasion of his 70th birthday. Suppose λ1 ≥ · · · ≥ λn ≥ 0 are the eigenvalues of an n × n totally nonnegative matrix, and ˜ λ1 ≥ · · · ≥ ˜ λk are the eigenvalues of a k × k principal submatrix.
Chi-kwong Li, Roy Mathias
core  

Stochastic Gradient Descent in High Dimensions for Multi‐Spiked Tensor PCA

Communications on Pure and Applied Mathematics, Volume 79, Issue 10, Page 2291-2369, October 2026.
ABSTRACT We study the high‐dimensional dynamics of online stochastic gradient descent (SGD) for the multi‐spiked tensor model. This multi‐index model arises from the tensor principal component analysis (PCA) problem with multiple spikes, where the goal is to estimate the unknown signal vectors within the N$N$‐dimensional unit sphere through maximum ...
Gérard Ben Arous, Cédric Gerbelot, Vanessa Piccolo   +2 more
wiley   +1 more source

Active Compensation Fault-Tolerant Control for Uncertain Systems with Both Actuator and Sensor Faults. [PDF]

Sensors (Basel)
Ling X, Xu H, Zhu F.
europepmc   +1 more source

The Stratified Geography of Authorship: A U‐Shaped Relationship Between Journal Influence Tier and Author‐Country Concentration in Sociology

Learned Publishing, Volume 39, Issue 4, October 2026.
ABSTRACT This study contributes to the literature on global inequality in scientific knowledge production by examining how author‐country concentration varies with journals' positions in the academic publishing hierarchy. Using a longitudinal dataset of sociology journals from the Web of Science and Journal Citation Reports covering 1997–2022, we ...
Fan Zhang, Lili Wang, Xianwen Wang, Guangyao Zhang   +3 more
wiley   +1 more source

Global convergence of a blind iterative algorithm for simultaneous conjugate match of N-ports. [PDF]

Sci Rep
Colangeli S, Serino A, Ciccognani W, Longhi PE, Limiti E.   +4 more
europepmc   +1 more source

An epidemic model through information-induced vaccination and treatment under fuzzy impreciseness. [PDF]

Model Earth Syst Environ, 2022
Mahato P, Das S, Mahato SK.
europepmc   +1 more source

Information Design for Early‐Stage Dose‐Finding Trials

Naval Research Logistics (NRL), Volume 73, Issue 7, Page 1141-1158, October 2026.
ABSTRACT To enhance enrollment rates in early‐stage dose‐finding clinical trials, we propose an information design approach, where the clinical investigator (CI) commits to an information releasing mechanism (IRM) based on the treatment's uncertain efficacy and toxicity to encourage patients to participate in the trial.
Amin Khademi, Ningyuan Chen
wiley   +1 more source

Generalizing Matrix Representations to Fully Heterochronous Ranked Tree Shapes. [PDF]

Bull Math Biol
Jennings-Shaffer C, Chen ZC, Palacios JA, Matsen FA.   +3 more
europepmc   +1 more source

The Complexity of Vector Partition. [PDF]

Vietnam J Math, 2022
Onn S.
europepmc   +1 more source