Influence measures based on the volume of confidence ellipsoids for GEE. (English) Zbl 1316.62160
Summary: The generalized estimating equations (GEE) derived by K.-Y. Liang and S. L. Zeger [Biometrika 73, 13–22 (1986; Zbl 0595.62110)] to analyze longitudinal data have been used in a wide range of medical and biological applications. To make regression a useful and meaningful statistical tool, emphasis should be placed not only on inference or fitting, but also on diagnosing potential data problems. Most of the usual diagnostics for linear regression models have been generalized for GEE. However, global influence measures based on the volume of confidence ellipsoids are not available for GEE analysis. This article presents an extension of these measures that is valid for correlated-measures regression analysis using GEEs. The proposed measures are illustrated by an analysis of epileptic seizure count data arising from a study of prograbide as an adjuvant therapy for partial seizures and some simulated data sets.
MSC:
| 62P10 | Applications of statistics to biology and medical sciences; meta analysis |
Citations:
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