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DTSTART:20201101T020000
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DTSTART:20210314T020000
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UID:calendar.404826.field_event_date.0@www.wright.edu
DTSTAMP:20260219T201631Z
CREATED:20201102T185810Z
DESCRIPTION:Meet-n-Greet: 3:30 p.m.\, Talk: 4:00 p.m.Speaker: Dr. Sixia Che
 n\, University of OklahomaTitle: General-purpose multiply robust data inte
 gration procedure for combining probability and non-probability samplesHos
 t: Dr. Zheng Xu ABSTRACT:Recently\, there has been an increased interest i
 n combining probability and nonprobability samples. Non-probability sample
  are cheaper and quicker to conduct. However\, the resulting estimators ar
 e vulnerable to bias as the selection probabilities are unknown. To adjust
  for the potential bias\, estimation procedures based on parametric or non
 parametric models has been discussed in the literature. The validity of th
 e resulting estimators depends on the validity of the underlying models. A
 lso\, nonparametric approaches suffer from the curse of dimensionality and
  poor efficiency. We propose a data integration approach by combining mult
 iple outcome regression models and propensity score models. The proposed a
 pproach can be used for estimating general parameters including totals\, m
 eans\, distribution functions and percentiles. The resulting estimators ar
 e multiply robust in the sense that they remain consistent if all but one 
 model are mis specified. The asymptotic properties of point and variance e
 stimators will be established. The results from a simulation study shows t
 he benefits of the proposed method in terms of bias and efficiency.SPEAKER
  BIO:Dr. Sixia Chen is an assistant professor at department of biostatisti
 cs and epidemiology of University of Oklahoma Health Sciences Center. Dr. 
 Chen got BA degree in Math from Fudan University at China and PhD degree i
 n Statistics at Iowa State University. His research interests include surv
 ey sampling\, missing data analysis\, statistical disclosure control\, emp
 irical likelihood method\, and big data. Dr. Chen had more than 46 publica
 tions in peer reviewed journals including Biometrika\, Annals of Applied S
 tatistics\, and Statistica Sinica. He is now serving as the Associate Edit
 or for Journal of Korean Statistical Society\, Journal of Survey Statistic
 s and Methodology\, and Scandinavian Journal of Statistics. Dr. Chen is se
 rving as the director of novel methodology unit of Oklahoma Shared Clinica
 l and Translational Research at OUHSC. Dr. Chen performed as PI for severa
 l local and NIH funded projects.Event Webpage: https://wright.webex.com/wr
 ight/j.php?MTID=mc5a5a66d526d5ca445fa5a683183d0c9
DTSTART;TZID=America/New_York:20201120T153000
DTEND;TZID=America/New_York:20201120T170000
LAST-MODIFIED:20201102T200558Z
SUMMARY:Mathematics and Statistics Colloquium
URL;TYPE=URI:/events/mathematics-statistics-colloquiu
 m-25
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