Results 11 to 20 of about 3,152,770 (169)

Efficient transformed ratio-type estimator using single auxiliary information

Kuwait Journal of Science, 2021
This paper purposes an efficient transformed ratio-type estimator for the estimation of population variance of study variable (y) by utilizing single auxiliary information (x) under simple random sampling without-replacement.
Sana Amjad, Ismail Muhammad
doaj   +1 more source

The Efficiency of a Ratio Product Estimator in the Estimation of the Finite Population Coefficient of Variation

Engineering Proceedings, 2023
Ratio product estimators have been proposed by several authors for the estimation of the population mean and population variance, but very few authors have proposed ratio product estimators for the estimation of the population coefficient of variation ...
Yahaya Zakari, Mojeed Abiodun Yunusa, Rashida Abdulrahman, Isah Muhammad, Aminu Suleiman Mohammed, Ahmed Audu   +5 more
doaj   +1 more source

Fractional Variability—A Tool to Study Blazar Variability [PDF]

Galaxies, 2019
Active Galactic Nuclei emit radiation over the whole electromagnetic spectrum up to TeV energies. Blazars are one subtype with their jets pointing towards the observer. One of their typical features is extreme variability on timescales, from minutes to years.
Bernd Schleicher, Axel Arbet-Engels, Dominik Baack, Matteo Balbo, Adrian Biland, Michael Blank, Thomas Bretz, Kai Bruegge, Michael Bulinski, Jens Buss, Manuel Doerr, Daniela Dorner, Dominik Elsaesser, Sergej Grischagin, Dorothee Hildebrand, Lena Linhoff, Karl Mannheim, Sebastian Mueller, Dominik Neise, Andrii Neronov, Maximilian Noethe, Aleksander Paravac, Wolfgang Rhode, Florian Schulz, Kevin Sedlaczek, Amit Shukla, Vitalii Sliusar, Elan Willert, Roland Walter   +28 more
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A Class of Exponential Regression Type Estimators for Population Variance in Two-Phase Sampling [PDF]

Journal of Statistical Theory and Applications (JSTA), 2017
This article deals with the problems of efficient estimation of population variance in two-phase (double) sampling. Using information on two auxiliary variables, a class of chain exponential to regression type estimators has been proposed and its ...
A. Chatterjee, G.N. Singh, A. Bandyopadhyay   +2 more
doaj   +1 more source

Derived variables for longitudinal studies [PDF]

Proceedings of the National Academy of Sciences, 1999
Suppose that for each individual a vector of features is measured at a number of time points. We look for a transformation of the features, the same at all time points, that will induce a simple dependency structure. In the simplest situation this requires that a certain asymmetric matrix has real nonzero eigenvalues. Extensions are considered.
Cox, D. R., Wermuth, Nanny
openaire   +4 more sources

Improved procedures for mean estimation under non-response

Alexandria Engineering Journal, 2022
In this paper, two generalized class such as ratio to exponential and the difference type of estimators have been proposed for estimating the finite population mean by utilizing information on higher order moments of an auxiliary variable in the two ...
Ashok K. Jaiswal, G.N. Singh, Awadhesh K. Pandey   +2 more
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Dexterous Estimation of Population Mean in Survey Sampling Under Non-Response Error [PDF]

International Journal of Mathematical, Engineering and Management Sciences, 2019
In this scripture, we ponder the problem of efficient estimation of population mean of study variable utilizing information on highly correlated auxiliary variables under the presence of non-response on either of the variables.
S. K. Yadav, O. P. Yadav, D. K. Yadav
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Efficient Utilization of Auxiliary Information on Estimation of Population Mean Using Exponential Type Estimators in Successive Sampling [PDF]

Journal of Statistical Theory and Applications (JSTA), 2017
This paper advocates the problem of estimating the population mean on the current occasion in two occasion successive (rotation) sampling under the transformed auxiliary variable using exponential method of estimation.
Surya K. Pal, Housila P. Singh
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Predictive Estimation of Finite Population Mean in Case of Missing Data Under Two-phase Sampling

Journal of Statistical Theory and Applications (JSTA), 2023
The present paper deals with the problem of estimation of finite population mean of study variable using two auxiliary variables in two-phase sampling scheme using predictive approach in case of missing values of the study variable and unknown population
Lovleen Kumar Grover, Anchal Sharma
doaj   +1 more source

A chain ratio exponential type estimator in two-phase sampling using auxiliary information

Statistica, 2014
This paper advocates the problem of estimating the population mean of the study variable y using the information on two auxiliary variables x and z. We have suggested the family of chain ratio exponential type estimators in two-phase (or double) sampling.
Rohini Yadav, Lakshmi N. Upadhyaya, Housila P. Singh, S. Chatterjee   +3 more
doaj   +1 more source