Results 41 to 50 of about 740 (113)

Predicting fatigue using countermovement jump force-time signatures: PCA can distinguish neuromuscular versus metabolic fatigue.

PLoS ONE, 2019
PurposeThis study investigated the relationship between the ground reaction force-time profile of a countermovement jump (CMJ) and fatigue, specifically focusing on predicting the onset of neuromuscular versus metabolic fatigue using the CMJ.MethodTen ...
Paul Pao-Yen Wu, Nicholas Sterkenburg, Kirsten Everett, Dale W Chapman, Nicole White, Kerrie Mengersen   +5 more
doaj   +1 more source

A Hybrid Nonparametric Framework for Outlier Detection in Functional Time Series

Environmetrics, Volume 37, Issue 4, May 2026.
ABSTRACT Outlier detection in functional time series is challenging due to temporal dependence and the simultaneous presence of magnitude, shape, and partial anomalies. Existing methods often assume independence or rely on model based approaches, such as the Standard Smoothed Bootstrap on Residuals (SmBoR), which may not work well if the model is ...
David Solano, Ruben Dario Guevara, Sergio A. Calderón V., Marc Saez, Maria A. Barceló   +4 more
wiley   +1 more source

A New Approach to Statistical Inference for Functional Time Series

Journal of Time Series Analysis, Volume 47, Issue 3, Page 675-686, May 2026.
ABSTRACT The analysis of time‐indexed functional data plays an important role in the field of business and economic statistics. In the literature, statistical inference for functional time series often involves reducing the dimension of functional data to a finite dimension K$$ K $$, followed by the use of tools from multivariate analysis.
Hanjia Gao, Yi Zhang, Xiaofeng Shao
wiley   +1 more source

Beaks of the Permo‐Triassic: a morpho‐functional analysis at the dawn of a novel structure in tetrapod evolution

Palaeontology, Volume 69, Issue 3, 2026.
Abstract The Triassic was a unique time for beak evolution, as seen in a wide diversity of terrestrial tetrapods. Beaks were present in dicynodont synapsid survivors of the Permo‐Triassic mass extinction event (PTME) and evolved independently several times in archosauromorphs and their relatives.
Damiano Landi, James L. King, Suresh A. Singh, Emily J. Rayfield, Michael J. Benton   +4 more
wiley   +1 more source

Oil and the stock market revisited: A mixed functional VAR approach

Quantitative Economics, Volume 17, Issue 2, Page 541-589, May 2026.
This paper proposes a new mixed vector autoregression (MVAR) model to examine the relationship between aggregate time series and functional variables in a multivariate setting. The model facilitates a reexamination of the oil‐stock price nexus by estimating the effects of demand and supply shocks from the global market for crude oil on the entire ...
Hilde C. Bjørnland, Yoosoon Chang, Jamie L. Cross   +2 more
wiley   +1 more source

Wastewater-Based Epidemiology of Stimulant Drugs: Functional Data Analysis Compared to Traditional Statistical Methods.

PLoS ONE, 2015
BackgroundWastewater-based epidemiology (WBE) is a new methodology for estimating the drug load in a population. Simple summary statistics and specification tests have typically been used to analyze WBE data, comparing differences between weekday and ...
Stefania Salvatore, Jørgen Gustav Bramness, Malcolm J Reid, Kevin Victor Thomas, Christopher Harman, Jo Røislien   +5 more
doaj   +1 more source

Dynamic Factor Analysis for Sparse and Irregular Longitudinal Data: An Application to Metabolite Measurements in a COVID‐19 Study

Statistics in Medicine, Volume 45, Issue 6-7, March 2026.
ABSTRACT Factor analysis (FA) can be used to identify key biomarkers in biological processes by assuming that latent biological pathways (statistically, “latent factors”) drive the activity of measurable biomarkers (“observed variables”). However, biological pathways often interact, meaning that the classical FA assumption of independence between ...
Jiachen Cai, Robert J. B. Goudie, Brian D. M. Tom   +2 more
wiley   +1 more source

Data-Driven Characterization of Heart Rate Dynamics During Sleep Using Functional Data Analysis

Epidemiology, Biostatistics and Public Health
Introduction Obstructive Sleep Apnea (OSA) is a highly prevalent sleep disorder characterized by recurrent upper airway obstruction during sleep, leading to intermittent hypoxia and autonomic nervous system dysregulation. Heart Rate Variability (HRV),
Samuele Minari, Serajeddin Ebrahimian, Antonella Zambon, Carolina Lombardi, Martino Pengo   +4 more
doaj   +1 more source

Advances in Modal Regression: From Theoretical Foundations to Practical Implementations

WIREs Computational Statistics, Volume 18, Issue 1, March 2026.
Modal regression. ABSTRACT Modal regression has emerged as a powerful alternative to traditional mean and quantile regression by focusing on estimating the conditional mode rather than the conditional mean or quantiles. This approach offers robustness to outliers and skewed distributions while providing more informative prediction intervals for ...
Sijia Xiang, Weixin Yao, Xinping Cui
wiley   +1 more source

Survival on Image Regression With Application to Partially Functional Distributional Representation of Physical Activity

Statistical Analysis and Data Mining: An ASA Data Science Journal, Volume 19, Issue 1, February 2026.
ABSTRACT Technological advancements in wearable devices and medical imaging often lead to high‐dimensional physiological signals in the form of images or surfaces. To address these data structures, we develop a novel survival on image regression model with a specific focus on partially functional distributional representation of wearable data.
Rahul Ghosal, Sunwoo Emma Cho, Marcos Matabuena   +2 more
wiley   +1 more source