# PROF.POKHARIYAL GANESH P

## M.Sc. Mathematics 1st Class, M.Sc. Physics, 2nd Class, Allahabad University.Ph.D. and D.SC. Mathematics,Banaras Hindu University.

pokhariyal@uonbi.ac.ke

pokhariyal@uonbi.ac.ke

- Citation:
- Pokhariya GP, Kikechi CB, Simwa RO. "On Local Linear Regression Estimation of Finite Population Totals in Model Based Surveys." American Journal of Theoretical and Applied Statistics. 2018;7((3)):92-101 .

In this paper, nonparametric regression is employed which provides an estimation of unknown finite population

totals. A robust estimator of finite population totals in model based inference is constructed using the procedure of local linear

regression. In particular, robustness properties of the proposed estimator are derived and a brief comparison between the

performances of the derived estimator and some existing estimators is made in terms of bias, MSE and relative efficiency.

Results indicate that the local linear regression estimator is more efficient and performing better than the Horvitz-Thompson

and Dorfman estimators, regardless of whether the model is specified or mispecified. The local linear regression estimator also

outperforms the linear regression estimator in all the populations except when the population is linear. The confidence

intervals generated by the model based local linear regression method are much tighter than those generated by the design

based Horvitz-Thompson method. Generally the model based approach outperforms the design based approach regardless of

whether the underlying model is correctly specified or not but that effect decreases as the model variance increases.

Keywords: Nonparametric Regression, Finite Population Totals, Local Linear Regression, Robustness Properties,

Confidence Intervals, Model Based Surveys