Usman Shahzad

Robust-regression-type estimators for improving mean estimation of sensitive variables by using auxiliary information

Nasir Ali, Ishfaq Ahmad, Muhammad Hanif et al. · Communication in Statistics- Theory and Methods · 2019 · 55 citations

Natural Sciences, Mathematics, Econometrics +11

Imputation based mean estimators in case of missing data utilizing robust regression and variance–covariance matrices

Usman Shahzad, Nadia Hashim Al-Noor, Muhammad Hanif et al. · Communications in Statistics - Simulation and Computation · 2020 · 41 citations

Natural Sciences, Biostatistics, Mathematics +17

Quantile regression-ratio-type estimators for mean estimation under complete and partial auxiliary information

Usman Shahzad, Muhammad Hanif, Irsa Sajjad et al. · Scientia Iranica · 2020 · 40 citations · Full text

Natural Sciences, Economics, Mathematics +13

A new class of ratio-type estimators for improving mean estimation of nonsensitive and sensitive variables by using supplementary information

Usman Shahzad, Pier Francesco Perri, Muhammad Hanif · Communications in Statistics - Simulation and Computation · 2018 · 36 citations

Natural Sciences, Biostatistics, Experimental Design +16

Robust Regression-Ratio-Type Estimators of the Mean Utilizing Two Auxiliary Variables: A Simulation Study

Tolga Zaman, Emre Dünder, Ahmed Audu et al. · Mathematical Problems in Engineering · 2021 · 34 citations · Full text

Natural Sciences, Economics, Econometrics +10