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Activity Number: 423
Type: Contributed
Date/Time: Wednesday, August 1, 2007 : 10:30 AM to 12:20 PM
Sponsor: Section on Statistical Computing
Abstract - #308534
Title: Implementation of an Extended Familial Correlation Structure with Quasi-Least Squares
Author(s): Jichun Xie*+ and Justine Shults
Companies: University of Pennsylvania and University of Pennsylvania
Address: School of Medicine, 5th Floor Blockley Hall, Philadelphia, PA, 19104-6021,
Keywords: quasi-least squares ; qlsinr ; extended familial data
Abstract:

The method of quasi-least squares (QLS, Chaganty and Shults, 1999) is an approach in the framework of GEE that allows for easier implementation of the extended familial correlation structure. We discuss this structure and its implementation in an analysis of a study in Ophthalmology using the qlsinr function for R software. An important goal of our presentation is to explain and demonstrate implementation of qlsinr, so that audience members will be able to implement this free software in their own analyses.

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Revised September, 2007