This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.

Abstract Details

Activity Number: 428
Type: Contributed
Date/Time: Tuesday, August 3, 2010 : 2:00 PM to 3:50 PM
Sponsor: Section on Statistics and the Environment
Abstract - #307123
Title: Product-Sum Modeling for Space-Time Analysis: An Environmental Application
Author(s): Zhen Jiang*+ and Richard Bilonick
Companies: University of Pittsburgh and University of Pittsburgh
Address: , , ,
Keywords: Space-time analysis ; Product-sum model ; Kriging ; PM2.5
Abstract:

Many environmental studies involve both spatial and temporal process. Analyzing only one process will lead to loss of information. In Pittsburgh Aerosol Research and Inhalation Epidemiologic Study (PARIES), we implement product-sum model to incorporate both spatial and temporal information for interpolating exposure (i.e. PM2.5) measurements. PM2.5 data is collected between 01/01/2001 and 12/31/2003 from 40 sites located around western Pennsylvania. Seasonal pattern is removed using splines. We model spatial and temporal variogram separately based on detrended residuals and then combine them to get the joint spatial-temporal variogram using product-sum model. Finally, we interpolate unobserved PM2.5 using ordinary kriging which provides an optimal set of weights. We report the results and show product-sum modeling and kriging yield nice properties for interpolated exposure measurements.


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