RAND Statistics Seminar Series

Using the Whole Cohort in Two-Phase Study Designs

Presented by Professor Thomas Lumley, University of Washington
Thursday, June 11, 2009
10:30 a.m. – 12:00 p.m. PT / 1:30pm – 3:00pm ET
Conference Room 2309
RAND Corporation, Santa Monica, CA
Please contact Denise Miller if you would like to attend this seminar.


It is often desirable to measure additional variables on a subsample of an existing cohort, panel, or other sample. This subsampling raises both design and analysis questions: who should be sampled, and how can the data be analysed most efficiently. These questions fall into the gaps between epidemiology (which gives simple, but inefficient approaches), survey statistics (which answers the question only when the target of inference is the population mean), and semiparametric theory (which gives answers that no-one can understand). I will describe a simple approach that gives reasonably efficient estimation of regression models using the whole dataset in a two-phase sample.

Speaker Bio

Dr. Thomas Lumley is an Associate Professor of Biostatistics at the University of Washington, and a member of the R Core Development Team. He has a PhD in Biostatistics from the University of Washington, an M.Sc. in Applied Statistics from Oxford, and a B.Sc(Hons) in Pure Mathematics from Monash University. His research interests relevant to social sciences include statistical computing and graphics, analysis of networks of two-sample comparisons, and model-robust estimation in semiparametric models, Bayesian models, and probability samples. He also works in cardiovascular epidemiology and pharmacogenomics.

Attending a Seminar

Other Locations/Times:
Washington, D.C. Conf. Rm. 4132: 1:30 p.m. ET
Pittsburgh Conf. Rm. 6202: 1:30 p.m. ET

RAND visitors are welcome to attend and must RSVP at least one day prior to the seminar. To ensure your attendance please contact Denise Miller at dmiller@rand.org with your name, company (or university) affiliation, and national citizenship (for security purposes).

For parking and directions to RAND's Santa Monica office, please see: http://www.rand.org/about/locations/santa-monica.html.

For parking and directions to RAND's Pittsburgh office, please see: http://www.rand.org/about/locations/pittsburgh.html.

For further information and to be added to the mailing list contact Denise Miller at dmiller@rand.org.