Results 31 to 40 of about 7,599 (306)

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

Calibrated estimators of the ratio

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

INVESTIGATION OF ALTERNATIVE CALIBRATION ESTIMATORS IN THE PRESENCE OF NONRESPONSE [PDF]

, 2017
Calibration weighting is widely used to decrease variance, reduce nonresponse bias, and improve the face validity of survey estimates. In the purely sampling context, Deville and Särndal (1992) demonstrate that many alternative forms of calibration ...
Han, Daifeng
core   +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

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

Robust approaches to remote calibration of a transmitting array [PDF]

, 2010
We consider the problem of estimating the gains and phases of the RF channels of a M-element transmitting array, based on a calibration procedure where M orthogonal signals are sent through M orthogonal beams and received on a single antenna.
Bidon, Stéphanie, Larue de Tournemine, Cécile, Besson, Olivier   +2 more
core   +1 more source

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

Integrating endogeneity in survey sampling using instrumental-variable calibration estimator

Heliyon
The endogeneity problem arises when the auxiliary variables correlate to the error terms. In such cases, appropriate instrumental variables ensure efficient estimation.
Muhammad Nadeem Intizar, Muhammad Ahmed Shehzad, Haris Khurram, Soofia Iftikhar, Aamna Khan, Abdul Rauf Kashif   +5 more
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