2024 : 4 : 28
Mehran Naghizadeh Qomi

Mehran Naghizadeh Qomi

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Mathematical Sciences
Address: Department of Statistics - University of Mazandaran - Babolsar- Iran
Phone: 01135302473

Research

Title
Pretest Shrinkage Estimators for the Shape Parameter of a Pareto Model using Prior Point Knowledge and Record Observations
Type
JournalPaper
Keywords
Shrinkage test estimator, log square error loss, Pareto distribution
Year
2017
Journal Metodološki zvezki - Advances in Methodology and Statistics
DOI
Researchers leila barmoodeh ، Mehran Naghizadeh Qomi

Abstract

Considering a Pareto model with unknown shape and scale parameters $\alpha$ and $\beta$, respectively, we are interested in Thompson shrinkage test estimation for the shape parameter $\alpha$ under the Squared Log Error Loss (SLEL) function. We find a risk-unbiased estimator for $\alpha$ and compute its risk under the SLEL. According to Thompson (1986), we construct the pretest shrinkage (PTS) estimators for $\alpha$ with the help of a point guess value $\alpha_0$ and record observations. We investigate the risk-bias of these estimators and compute their risks numerically. A comparison is performed between the PTS estimators and a risk-unbiased estimator. A numerical example is presented for illustrative and comparative purposes. We end the paper by discussion and concluding remarks.