Abstract #300990

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JSM 2002 Abstract #300990
Activity Number: 51
Type: Contributed
Date/Time: Sunday, August 11, 2002 : 4:00 PM to 5:50 PM
Sponsor: Biometrics Section*
Abstract - #300990
Title: Diagnostics for Random Coefficient Mixed Models with Unweighted and Weighted Data
Author(s): Julia Bienias*+ and Charles Hall
Affiliation(s): Rush Presbyterian-St. Luke's Medical Center and Albert Einstein College of Medicine
Address: 1645 W. Jackson Blvd., Suite 675, Chicago, Illinois, 60612,
Keywords: complex survey data ; longitudinal data ; mixed models
Abstract:

We present a set of useful diagnostics for checking model assumptions and model fit for a type of mixed model for longitudinal data, random coefficient models. Because of the increasing use of complex sampling designs in longitudinal studies, there is a need for diagnostics that can be used with data with unequal probabilities of selection. In particular, the usual diagnostics, both graphical and quantitative, might give misleading results with weighted data because of the unequal sampling weights. Thus, we also present a set of diagnostics that can be applied in that setting. We illustrate with several realistic data examples.

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Revised March 2002