Titolo: Longitudinal Data Observed Over Unequal Time Intervals: Modeling Correlations In The Analysis Of Binary Outcomes Data
Editore: VDM Verlag Dr. M�ller
Data di pubblicazione: 2008
Lingua: Inglese
ISBN 10: 3639110145
ISBN 13: 9783639110142
Rilegatura: Brossura
Condizione: New

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Riassunto

This monograph extends previous work on the evaluation of GEE performance in parameter estimation with correlation structure misspecification. It examines a new structure to model the correlation between binary responses observed over unequal time intervals. The proposed unequal-time correlation structure accounts for unequal intervals by fixing the correlation coefficient and interval length between the first 2 observations and by adjusting the correlations for subsequent pairs by their relative interval length. To evaluate this structure, correlated binary responses under the logistic model were generated with the unequal time correlation structure for a full range of positive correlations and strength of association under different scenarios of number of measurements, sample size and prevalence of exposure. The model was evaluated when the working correlation structure was misspecified as exchangeable, 1st order autoregressive, unstructured, or when alternating logistic regression was employed.

L'autore

Soe Soe Thwin received her MS in Epidemiology from University of Washington and PhD in Biostatistics from Boston University, USA. She is currently a statistician at the Massachusetts Veterans Epidemiologic Research and Information Center and consults for Boston University School of Medicine.

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