arXiv subjects

Nirmala Sawan

Publications and source records attributed to Nirmala Sawan.

5 recordsLinked to original sources

arXiv2009

Ratio Estimators in Simple Random Sampling Using Information on Auxiliary Attribute

Some ratio estimators for estimating the population mean of the variable under study, which make use of information regarding the population proportion possessing certain attribute, are proposed. Under simple random sampling without replacement (SRSWOR) scheme, the expressions of bias and mean-squared error (MSE) up to the first order of approximation are derived. The results obtained have been illustrated numerically by taking some empirical population considered in the literature.

math.GM↗

arXiv2009

Improved Exponential Estimator for Population Variance Using Two Auxiliary Variables

In this paper exponential ratio and exponential product type estimators using two auxiliary variables are proposed for estimating unknown population variance $S_y^2$. Problem is extended to the case of two-phase sampling. Theoretical results are supported by an empirical study.

math.GM↗

arXiv2008

Improvement in Estimating Population Mean using Two Auxiliary Variables in Two-Phase Sampling

This study proposes improved chain-ratio type estimator for estimating population mean using some known values of population parameter(s) of the second auxiliary character. The proposed estimators have been compared with two-phase ratio estimator and some other chain type estimators. The performances of the proposed estimators have been supposed with a numerical illustration.

math.GM↗

arXiv2007

Auxiliary Information and A Priori Values in Construction of Improved Estimators

This volume is a collection of six papers on the use of auxiliary information and 'a priori' values in construction of improved estimators. The work included here will be of immense application for researchers and students who emply auxiliary information in any form.

stat.ME↗

arXiv2007

A General Family of Estimators for Estimating Population Mean Using Known Value of Some Population Parameter(s)

A general family of estimators for estimating the population mean of the variable under study, which make use of known value of certain population parameter(s), is proposed. Under Simple Random Sampling Without Replacement (SRSWOR) scheme, the expressions of bias and mean-squared error (MSE) up to first order of approximation are derived. Some well known estimators have been shown as particular member of this family. An empirical study is carried out to illustrate the performance of the constructed estimator over others.

math.ST↗