Results 31 to 40 of about 72,082 (280)
Direction-of-Change Forecasts Based on Conditional Variance, Skewness and Kurtosis Dynamics : International Evidence [PDF]
Recent theoretical work has revealed a direct connection between asset return volatility forecastability and asset return sign forecastability. This suggests that the pervasive volatility forecastability in equity returns could, via induced sign ...
Yiu Kuen Tse +4 more
core +4 more sources
Diffusion Kurtosis Imaging of Microstructural Changes in Gray Matter Nucleus in Parkinson Disease
Frontiers in Neurology, 2020 Objective: To explore the microstructural damage of extrapyramidal system gray matter nuclei in Parkinson disease (PD) using diffusion kurtosis imaging (DKI).Materials and Methods: We enrolled 35 clinically confirmed PD patients and 23 healthy volunteers.
Gao Bingbing +10 more
doaj +1 more source
Scientific Reports, 2021 Measurements of water diffusion with MRI have been used as a biomarker of tissue microstructure and heterogeneity. In this study, diffusion kurtosis tensor imaging (DKTI) of the brain was undertaken in 10 healthy volunteers at a clinical field strength ...
Ahmed Maiter +11 more
doaj +1 more source
A Hybrid EMD-Kurtosis Method for Estimating Fetal Heart Rate from Continuous Doppler Signals
Frontiers in Physiology, 2017 Monitoring of fetal heart rate (FHR) is an important measure of fetal wellbeing during the months of pregnancy. Previous works on estimating FHR variability from Doppler ultrasound (DUS) signal mainly through autocorrelation analysis showed low accuracy ...
Haitham M. Al-Angari +4 more
doaj +1 more source
Data Science Journal, 2010 An alternative ratio-cum-product estimator of population mean using the coefficient of kurtosis for two auxiliary variates has been proposed. The proposed estimator has been compared with a simple mean estimator, the usual ratio estimator, a product ...
Rajesh Tailor +2 more
doaj +1 more source
Frontiers in Neurology, 2020 Background: Early imaging-based treatment response assessment of brain metastases following stereotactic radiosurgery (SRS) remains challenging. The aim of this study is to determine whether early (within 12 weeks) intratumoral changes in interstitial ...
Nathaniel Swinburne +11 more
doaj +1 more source
Removing skewness and kurtosis by transformation when testing for mean equality
Communications in Statistics - Simulation and Computation, 2019 A transformation of the Welch statistic to compare means is proposed to correct skewness and kurtosis of parent populations.
Isabel Parra-Frutos, Lourdes Molera
openaire +2 more sources
, 2021 Descriptive summary (mean, range, percentiles, skewness and kurtosis) of the cell dimensions (width, height and ratio).
Leonardo Vanneschi (11767436) +6 more
core +1 more source
Compliant Pneumatic Feet with Real‐Time Stiffness Adaptation for Humanoid Locomotion
Advanced Robotics Research, EarlyView.A compliant pneumatic foot with real‐time variable stiffness enables humanoid robots to adapt to changing terrains. Using onboard vision and pressure control, the foot modulates stiffness within each gait cycle, reducing impact forces and improving balance. The design, cast in soft silicone with embedded air chambers and Kevlar wrapping, offers durable,
Irene Frizza +3 more
wiley +1 more source
Frontiers in Neuroscience, 2021 The purpose of this study was to analyze microstructural alterations in cerebral gray matter using non-Gaussian diffusion kurtosis imaging (DKI) in neuromyelitis optica spectrum disorder (NMOSD) patients with optic neuritis (NMOSD-ON).
Hanjuan Zhang +6 more
doaj +1 more source