Results 21 to 30 of about 3,160,245 (302)

Ratio estimation in SIMS analysis [PDF]

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2011
The determination of an isotope ratio by secondary ion mass spectrometry (SIMS) traditionally involves averaging a number of ratios collected over the course of a measurement. We show that this method leads to an additive positive bias in the expectation value of the estimated ratio that is approximately equal to the true ratio divided by the counts of
Ogliore, R. C., Huss, G. R., Nagashima, K.   +2 more
openaire   +2 more sources

Discriminative Density-ratio Estimation [PDF]

Proceedings of the 2014 SIAM International Conference on Data Mining, 2014
The covariate shift is a challenging problem in supervised learning that results from the discrepancy between the training and test distributions. An effective approach which recently drew a considerable attention in the research community is to reweight the training samples to minimize that discrepancy.
Yun-Qian Miao, Ahmed K. Farahat, Mohamed S. Kamel   +2 more
openaire   +2 more sources

Generalized Power Transformation Estimators in Stratified Ranked Set Sampling using Auxiliary Information

International Journal of Bio-Resource and Stress Management, 2023
Auxiliary variable is commonly used in survey sampling to improve the precision of estimates. Whenever there is auxiliary information available, the researchers want to utilize it in the method of estimation to obtain the most efficient estimator ...
Nitu Mehta (Ranka), Latika Sharma
doaj   +1 more source

A Class of Estimators for Estimating the Variance of the Ratio Estimator

JOURNAL OF THE JAPAN STATISTICAL SOCIETY, 2004
Summary: We have proposed a class of estimators for the variance of the ratio estimator which includes two standard estimators \(V_0\), \(V_2\) and the estimators \(V_H\) and \(V_3\) suggested by \textit{R. M. Royall} and \textit{K. R. Eberhardt} [Sankya, Ser. C 37, 43--52 (1975; Zbl 0335.62007)] and \textit{C. F.
Upadhyaya, Lakshmi N., Singh, Housila P., Singh, Sarjinder   +2 more
openaire   +3 more sources

Exact methods for comparison of estimation strategies in survey sampling. [PDF]

, 2010
PhDMany strategies in survey sampling depend on large sample approximation formulae for design-based inference on finite population parameters, which are not valid for small samples. We develop an approach using matrix algebra to tackle many problems
Khan, Kaleem Uddin
core   +2 more sources

The generalization of ratio-cum product estimator for the arbitrary sample design

Lietuvos Matematikos Rinkinys, 2009
The generalization of a dual to ratio-cum-product estimator of the finite population total for the arbitrary sample design is given. The approximate variance is calculated and variance estimator is constructed.
Ignas Bartkus, Aleksandras Plikusas
doaj   +1 more source

Interval Estimation for the Sortino Ratio and the Omega Ratio [PDF]

Communications in Statistics - Simulation and Computation, 2013
In this article, asymptotic confidence intervals (CIs) for the Sortino and Omega ratios are proposed and analyzed. First, the CIs are derived under the assumption of temporal independence and identical distribution of returns. Later they are obtained assuming that the returns process is strictly stationary and α-mixing of a certain size.
openaire   +1 more source

On Some Predictive Ratio Type Estimators in Two Stage Sampling [PDF]

Journal of Statistical Theory and Applications (JSTA), 2013
Some predictive ratio type estimators in two stage sampling are derived following the model free predictive criterion proposed by Basu (1971) and these estimators are compared with the classical multistage ratio estimator and also with Smith’s (1969 ...
A.K.P.C. Swain, Sitanshu Shekhar Mishra, B.K. Pradhan   +2 more
doaj   +1 more source

Generalized Modified Ratio Estimator for Estimation of Finite Population Mean [PDF]

, 2013
A generalized modified ratio estimator is proposed for estimating the population mean using the known population parameters. It is shown that the simple random sampling without replacement sample mean, the usual ratio estimator, the linear regression ...
Jambulingam Subramani, Subramani, Jambulingam   +1 more
core   +1 more source

A Ratio and Ratio Exponential Estimator for Finite Population Mean in Case of Post-Stratification [PDF]

, 2019
This paper studies a ratio and ratio exponential estimator for population mean. The suggested estimator has been differentiated with unbiased estimator and ratio exponential estimator for population mean.
Tailor, Rajesh, Mehta, Priya
core   +1 more source