Volume 62, Issue 4

A Nonlinear Model with Latent Process for Cognitive Evolution Using Multivariate Longitudinal Data

Cécile Proust

Corresponding Author

INSERM E0338, Université de Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France

email:Cecile.Proust@isped.u‐bordeaux2.frSearch for more papers by this author
Hélène Jacqmin‐Gadda

INSERM E0338, Université de Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France

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Jeremy M. G. Taylor

Department of Biostatistics, University of Michigan, 1420 Washington Heights, Ann Arbor, Michigan 48109, U.S.A.

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Julien Ganiayre

INSERM E0338, Université de Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France

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Daniel Commenges

INSERM E0338, Université de Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France

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First published: 26 April 2006
Citations: 43

Abstract

Summary Cognition is not directly measurable. It is assessed using psychometric tests, which can be viewed as quantitative measures of cognition with error. The aim of this article is to propose a model to describe the evolution in continuous time of unobserved cognition in the elderly and assess the impact of covariates directly on it. The latent cognitive process is defined using a linear mixed model including a Brownian motion and time‐dependent covariates. The observed psychometric tests are considered as the results of parameterized nonlinear transformations of the latent cognitive process at discrete occasions. Estimation of the parameters contained both in the transformations and in the linear mixed model is achieved by maximizing the observed likelihood and graphical methods are performed to assess the goodness of fit of the model. The method is applied to data from PAQUID, a French prospective cohort study of ageing.

Number of times cited according to CrossRef: 43

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