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This is the preliminary program for the 2007 Joint Statistical Meetings in Salt Lake City, Utah.

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Activity Number: 236
Type: Topic Contributed
Date/Time: Tuesday, July 31, 2007 : 8:30 AM to 10:20 AM
Sponsor: IMS
Abstract - #309520
Title: Longitudinal Modeling When Response and Time-Dependent Covariates Are Measured at Different Time Points
Author(s): Joel Dubin*+ and Xiaoqin Xiong
Companies: University of Waterloo and University of Waterloo
Address: 200 University Ave W, Waterloo, ON, N2L 2H2, Canada
Keywords: longitudinal ; smoothing ; lagged association
Abstract:

In this talk, we will discuss some flexible methods to handle both association and temporal sequencing of distinct longitudinal measures, where the measures may be of mixed type (e.g., one continuous, the other binary) and recorded on nonuniform grids and different time points from one another. A smoothing step will be involved. The methods will be demonstrated on a dataset of hemodialysis patients, where longitudinal measures of health outcomes (e.g., infection) were recorded at different time points than longitudinal physiologic measures such as serum C-reactive protein levels (a marker for inflammation). An interesting scientific question to answer is whether experiences of infection follow or predate inflammation.


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Revised September, 2007