Results 21 to 30 of about 16,629 (155)

A Functional Data Approach to Outlier Detection and Imputation for Traffic Density Data on Urban Arterial Roads

Promet (Zagreb), 2022
In traffic monitoring data analysis, the magnitude of traffic density plays an important role in determining the level of traffic congestion. This study proposes a data imputation method for spatio-functional principal component analysis (s-FPCA) and ...
Bing Tang, Yao Hu, Huan Chen
doaj   +1 more source

K-Nearest Neighbor Method with Principal Component Analysis for Functional Nonparametric Regression

مجلة بغداد للعلوم, 2022
This paper proposed a new  method to study functional non-parametric regression data analysis with conditional expectation in the case that the covariates  are functional and the Principal Component Analysis was utilized to de-correlate the multivariate
Shelan Saied Ismaeel, Kurdistan M.Taher Omar, Bo Wang   +2 more
doaj   +1 more source

New Modeling Approaches Based on Varimax Rotation of Functional Principal Components

Mathematics, 2020
Functional Principal Component Analysis (FPCA) is an important dimension reduction technique to interpret the main modes of functional data variation in terms of a small set of uncorrelated variables.
Christian Acal, Ana M. Aguilera, Manuel Escabias   +2 more
doaj   +1 more source

Power transformer oil–paper insulation degradation modelling and prediction method based on functional principal component analysis

IET Science, Measurement & Technology, 2022
This study is for the case where the available data of power transformer oil–paper insulation is limited to a small amount furfural data, to solve the problems in oil–paper insulation degradation modelling, such as few samples available, unknown function
Yuehan Qu, Hongshan Zhao, Shice Zhao, Libo Ma, Zengqiang Mi   +4 more
doaj   +1 more source

A Novel Longitudinal Proteomic Aging Index Predicts Mortality, Multimorbidity, and Frailty in Older Adults. [PDF]

Aging Cell
We used proteomic data from three longitudinal visits in the ARIC study to construct a single longitudinal proteomic aging index (LPAI) that captures both cumulative aging burden and dynamic aging trajectories. Higher LPAI was associated with increased risks of mortality, frailty, and multimorbidity.
Rao Z, Wang S, Li A, Blaha MJ, Coresh J, Ganz P, Marshall CH, Pankow JS, Platz EA, Post W, Sedaghat S, Rotter JI, Whelton SP, Prizment A, Guan W.   +14 more
europepmc   +2 more sources

Functional Analysis of Continuous, High-Resolution Measures in Aging Research: A Demonstration Using Cerebral Oxygenation Data From the Irish Longitudinal Study on Aging

Frontiers in Human Neuroscience, 2020
Background: A shift towards the dynamic measurement of physiologic resilience and improved technology incorporated into experimental paradigms in aging research is producing high-resolution data.
John D. O’Connor, Matthew D. L. O’Connell, Matthew D. L. O’Connell, Roman Romero-Ortuno, Roman Romero-Ortuno, Belinda Hernández, Louise Newman, Richard B. Reilly, Rose Anne Kenny, Silvin P. Knight   +9 more
doaj   +1 more source

Phenological Variation and Evolution Across Space and Time in the Scarlet Monkeyflower (<i>Erythranthe cardinalis</i>). [PDF]

Ecol Evol
Climate change is altering ecological dynamics, particularly in species with latitudinal range variation. This study investigates how the scarlet monkeyflower's flowering phenology has evolved in response to recent droughts in California. We find that southern populations are flowering later and larger, while northern populations flower earlier and ...
Waits J, Larson N, Moazed MC, Regan A, Strebler M, Flores-Rentería L.   +5 more
europepmc   +2 more sources

Exploring functional data analysis and wavelet principal component analysis on ecstasy (MDMA) wastewater data

BMC Medical Research Methodology, 2016
Background Wastewater-based epidemiology (WBE) is a novel approach in drug use epidemiology which aims to monitor the extent of use of various drugs in a community.
Stefania Salvatore, Jørgen G. Bramness, Jo Røislien   +2 more
doaj   +1 more source

Mapping Mediterranean Forest Plant Associations and Habitats with Functional Principal Component Analysis Using Landsat 8 NDVI Time Series

Remote Sensing, 2020
The classification of plant associations and their mapping play a key role in defining habitat biodiversity management, monitoring, and conservation strategies.
Simone Pesaresi, Adriano Mancini, Giacomo Quattrini, Simona Casavecchia   +3 more
doaj   +1 more source

Copula Dynamic Conditional Correlation and Functional Principal Component Analysis of COVID-19 Mortality in the United States

Axioms, 2022
This paper shows a visual analysis and the dependence relationships of COVID-19 mortality data in 50 states plus Washington, D.C., from January 2020 to 1 September 2022.
Jong-Min Kim
doaj   +1 more source