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Research Interests:
Biostatistics, Sample survey design and inference, Projection, Bayesian statistics,
Non-response problem, Clinical trial, Statistical modeling.
Dr. Choi had worked for Parkinson Laboratory of VA Hospital, Minneapolis, Health Department of Ohio, and National Center for Health Statistics until the end of 2007. At the VA hospital, He designed the clinical trial for Symmetral, L-dopa, and other Parkinson medicines using cross-over design. He supervised the operation of clinical trial and wrote reports on the results of the trials. At Ohio Department of Health, he was dispatched to other departments as trouble shooter to solve difficult problems they could not solve; wrote the Ohio State plan for the needed long term care facilities in each county, reported the Cost-benefit analysis of the Ohio state laboratory and PKU program. He worked for National Center for Health Statistics for the past 31 years, was one of the most productive statisticians in the history of NCHS, producing more then 100 papers and reports. His research covers many areas of statistics, U.S mortality projection, Smoothing method for the mortality data collected by two different ICD codes,
Non-ignorable non-response model for survey data, Bayesian method to Calibrate the Body mass Index, Prediction of election outcome, Data coding and weighting of health interview survey, multistage cluster sampling design, and other health
related topics. He presented his papers and new ideas at over 130 seminars, lectures, special invited sessions and classes,
nationally and internationally. He has extensive teaching and supervising experiences: Teaching in High School, Invited Professor of Korea University and Johns Hopkins University, Teaching at special sessions, Supervising 12 students for masters and Ph.D. thesis. Dr. Choi joined the faculty of Department of Biostatistics, Medical College of Georgia in 2008 as Professor of Biostatistics and teaches the Statistics Theory II to graduate students. This course covers the mathematical statistics including Bayesian Statistics, maximum likelihood, testing hypothesis, and estimation.
Teaching Areas: Statistics Theory II
Selected Publications:
(2007) "Robust Bayesian Predictive Inference for the Finite Population Quantile of
a Small Area”, with Balgobin Nandram. Submitted to Journal of Nonparametric
Statistics
(2007) "Bayesian Methods for Incomplete Two-way Categorical Tables with Application to
the Buckeye State Polls” with Yousung Park, Bo-Seung Choi. Under review. Survey
Methodology
(2007) "Bayesian Simulation Intervals for Small Areas: An Application to Variation in
Maps" with Erik Erhardt and Balgobin Nandram. Under review. Journal of
Statistical Planning and Inference
(2007) "A Bayesian Prediction for Undecided Voters" with Balgobin Nandram. Accepted.
Survey Methodology
(2007) "A Bayesian Control Chart for a Passivation Process", with Nandram B and Ramirez B.
Case Studies in Business, Industry, and Government Statistics, (1):61-70
(2007) "Alternative Test of Independence in Two-Way Categorical Tables" with Balgobin
Nandram. Journal of Data Science, 5(2007), 217-237
(2006) "Bayesian Predictive Inference Under Informative Sampling and Transformation"
with Balgobin Nandram, Gang Shen, and Corinne Burgos. Applied Stochastic Models
in Business and Industry, 2006; 22:559-572
(2006) "A Parametric Approach for the Effects of the 10th ICD Revision on Mortality"
with YouSung Park. Applied Statistics, (JRSS, C)(2006) 55, Part 5, 677-697
(2006) "Forecasting Cause-Age Specific Mortality Using Two Random Processes" with
YouSung Park and HeeYoung Kim. Journal of American Statistical Association. Vol.101, No. 474, June 2006, 472-483
(2006) "A Balanced multi-level rotation sampling design and its efficient composite
estimators” with YouSung Park and Kee Whan Kim. Journal of Statistical Planning
and Inference. 137 (2007) 594-610
(2006) "A Bayesian Analysis of Two Way Categorical Table Incorporating Intraclass
Correlation" with Balgobin Nandram. Journal of Statistical Computation and
Simulation, Vol. 76, No. 3, March 2006, 233-249
(2005) "Bayesian Analysis of Nonignorable Missing Categorical Data: An Application
to Bone Mineral Density and Family Income" with Balgobin Nandram, and Larry Cox.
Survey Methodology, December, Vol. 31, No. 2, 213 - 225
(2005) "Hierarchical Bayesian Nonignorable Nonresponse Regression Models for Small
Areas: An application to the NHANES III Data" with Balgobin Nandram. Survey
Methodology, Vol. 31, No. 1, 73-84
(2005) "Bayesian Nonresponse Models for Categorical Data from Small Areas: An
Application to BMD and Age" with Balgobin Nandram, Ning Liu, and Lawrence Cox.
Statistics in Medicine, 24: 1047-1074
(2005) "A Comparison of the Choropleth Maps for Disease Mapping" with Balgobin Nandram
and Jie Liu. Journal of Data Science, Vol. 3, No. 1, 47-68
(2004) "Nonparametric Bayesian Analysis of a Proportion under Nonignorable Nonresponse"
with Balgobion Nandram. Journal of Nonparametric Statistics, Vol.16, No.6, 1-19
(2004) "Simultaneous Concentration Bands for Continuous Random Samples" with Balgobin
Nandram. Statistica Sinica, Vol.14, No.4, 1209-1219
(2003) "Nonparametric Study of Proportion in Small Areas with Nonignorable
Nonresponse" with Balgobin Nandram. Technical Report, No. 386, 171-180, Carleton
University
(2003) "Bayes Empirical Bayes Estimation of a Proportion under Nonignorable
Nonresponse" with Balgobin Nandram. Journal of the Korean Statistical Society,
Vol. 32, No. 2, 121-150
(2002) "A Hierarchical Bayesian Nonignorable Nonresponse Model for Multinomial Data
from Small Areas" with Balgobin Nandram, and Geunshik Han. Survey Methodology
Vol. 28, No. 2, 145-156.
(2002) "A Hierarchical Bayesian Nonresponse Models for Binary Data from Small Areas
with Uncertainty about Ignorability" with Balgobin Nandram. Journal of American
Statistical Association, Vol. 97, No. 458, 381-388.
(2002) "A Bayesian Analysis of a Proportion under Nonignorable Nonresponse" with
Balgobin Nandram. Statistics in Medicine, 21:1189-1212.
(2001) "One-level Rotation Design Balanced on Time in Monthly Sample and Rotation
Group" with YouSung Park, and KeeWhan Kim. Journal of American Statistical
Association, Vol. 96, No. 456, 1483-1496
(2000) "On the autocovariance function on INAR(1) process with a Negative Binomial or
Piosson marginal" with YouSung Park and Heeyoung Kim. Journal of the Korean
Statistical Society, Vol. 29, No. 3, 269-284.
(1999) "Relative Risk of Involuntary Injuries Among Employed Adults in the USA" with Ki
Moon Bang and Robert A. Wright. Human and Ecological Risk Assessment, Vol. 6,
1353-1370
(1990) "The U.S. Health Survey System", The 1990 Journal of the Korean Public Health
Association, 10-20
(1989) "An Adjustment Factor for Goodness of Fit and Independence Test for Correlated
and Weighted Observations" with Richard B. McHugh. Biometrics, 45, 979-996
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