Results 31 to 40 of about 619,717 (297)

Least-Squares Estimators of Drift Parameter for Discretely Observed Fractional Ornstein–Uhlenbeck Processes

Mathematics, 2020
We introduce three new estimators of the drift parameter of a fractional Ornstein–Uhlenbeck process. These estimators are based on modifications of the least-squares procedure utilizing the explicit formula for the process and covariance structure of a ...
Pavel Kříž, Leszek Szała
doaj   +1 more source

Calibrated estimators of the ratio

Lietuvos matematikos rinkinys, 2001
There is not abstract.
openaire   +4 more sources

Impact of Partial Randomized Response Technique on Stratified Calibration Estimators with Different Types of Distance Measures in the Presence of Measurement Error

Axioms
Calibration is a methodological approach that enhances the accuracy of population parameter estimates through the integration of auxiliary information. In this study, a new ratio calibration method has been developed with various distance measures under ...
Sat Gupta, Pidugu Trisandhya
doaj   +1 more source

On Accuracy of Calibration Estimators Supported by Auxiliary Variables from Past Periods Based on Simulation Analyses

Acta Universitatis Lodziensis. Folia Oeconomica, 2017
In sample surveys there is often a need to estimate not only population characteristics, but subpopulation characteristics as well. We consider the problem of estimating the total value in domains (subpopulations).
Tomasz Stachurski, Tomasz Żądło
doaj   +1 more source

Combining Viral Genetics and Statistical Modeling to Improve HIV-1 Time-of-infection Estimation towards Enhanced Vaccine Efficacy Assessment

Viruses, 2019
Knowledge of the time of HIV-1 infection and the multiplicity of viruses that establish HIV-1 infection is crucial for the in-depth analysis of clinical prevention efficacy trial outcomes.
Raabya Rossenkhan, Morgane Rolland, Jan P.L. Labuschagne, Roux-Cil Ferreira, Craig A. Magaret, Lindsay N. Carpp, Frederick A. Matsen IV, Yunda Huang, Erika E. Rudnicki, Yuanyuan Zhang, Nonkululeko Ndabambi, Murray Logan, Ted Holzman, Melissa-Rose Abrahams, Colin Anthony, Sodsai Tovanabutra, Christopher Warth, Gordon Botha, David Matten, Sorachai Nitayaphan, Hannah Kibuuka, Fred K. Sawe, Denis Chopera, Leigh Anne Eller, Simon Travers, Merlin L. Robb, Carolyn Williamson, Peter B. Gilbert, Paul T. Edlefsen   +28 more
doaj   +1 more source

Effect of Calibration for Tissue Differentiation Between Healthy and Neoplasm Lung Using Minimally Invasive Electrical Impedance Spectroscopy

IEEE Access, 2022
This study proposes a calibration method and analyses the effect of this calibration in lung measures, using minimally invasive electrical impedance spectroscopy with the 3-electrode method, for tissue differentiation between healthy and neoplasm lung ...
Georgina Company-Se, Lexa Nescolarde, Virginia Pajares, Alfons Torrego, Pere J. Riu, Javier Rosell, Ramon Bragos   +6 more
doaj   +1 more source

Calibrated Measures for Breast Density Estimation [PDF]

Academic Radiology, 2011
Breast density is a significant breast cancer risk factor measured from mammograms. Evidence suggests that the spatial variation in mammograms may also be associated with risk. We investigated the variation in calibrated mammograms as a breast cancer risk factor and explored its relationship with other measures of breast density using full field ...
John J, Heine, Ke, Cao, Dana E, Rollison
openaire   +2 more sources

A new modified estimator of population variance in calibrated survey sampling

Scientific Reports
In survey statistics, estimating and reducing population variation is crucial. These variations can occur in any sampling design, including stratified random sampling, where stratum weights may increase the variance of estimators. Calibration techniques,
Riffat Jabeen, Azam Zaka, M. Nagy, Hazem Al-Mofleh, Ahmed Z. Afify   +4 more
doaj   +1 more source

Class of Calibrated Estimators of Population Proportion Under Diagonal Systematic Sampling Scheme

Mathematics
Estimators of population characteristics which only exploit information of the study characters tend to be prone to outliers or extreme values that may characterize sampling information due to randomness in selection thereby making them to be less ...
Ahmed Audu, Maggie Aphane, Jabir Ahmad, Ran Vijay Kumar Singh   +3 more
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source