Trajectory Modelling by Shape

Thursday, 6 March 2014
9:30am to 10:30am
Ella Latham Theatre, Ground Floor, Royal Childrens Hospital
Flemington Road

Trajectory modelling provides a set of tools to analyse individual longitudinal data with a goal of yielding clusters of people who share 'similar' structure in the evolution of a variable of interest over time. In addition, the methods allow identification of covariates associated with separate cluster membership. These techniques depend on notions of similarity/dissimilarity between vector objects. I will briefly describe two distinct approaches to trajectory modelling, both of which are driven by the 'level' of the longitudinal variable to a great extent. I will discuss a recent alternative approach developed by my student, Brianna Heggeseth, that uses a different measure of similarity focusing on the 'shape' of the trajectories. The ideas will be motivated and applied to childhood growth patterns using data from the Centre for the Health Assessment of Mothers and Children of Salinas (CHAMACOS) study.


Prof. Nicholas Jewell

Department of Statistics
University of California

Nicholas P. Jewell is Professor of Biostatistics and Statistics at the University of California, Berkeley. Since arriving at Berkeley in 1981, he has held various academic and administrative positions, most notably serving as Vice Provost from 1994 to 2000. He has also served as an Assistant Professor of Statistics at Princeton University (1979–1981), and held academic appointments at the University of Edinburgh, Oxford University, the London School of Hygiene and Tropical Medicine, and at the University of Kyoto. In 2007, he was a Fellow at the Rockefeller Foundation Bellagio Study Centre in Italy.

Dr. Jewell is a Fellow of the American Statistical Association, the Institute of Mathematical Statistics, and the American Association for the Advancement of Science. He received the 2012 Marvin Zelen Leadership Award in Statistical Science from Harvard University. He is the 2005 winner of the Snedecor Award from COPSS, and won the Distinguished Teaching Award from the University of California, Berkeley's School of Public Health in 2004. In 2000, he was honored by the Director's Award from the Federal Emergency Management Agency for providing "extraordinary leadership and vision in implementing strategies that enhance the disaster resistance of the University of California, Berkeley, and universities throughout America." In addition the 2005 Alfred E. Alquist Award was given to UC Berkeley's SAFER program that he launched and led for many years.