Interpretation of mixed models and marginal models with cohort attrition due to death and drop-out.

Abstract:

:Mixed models estimated by maximum likelihood and marginal models estimated by generalized estimating equations are the standard methods for the analysis of longitudinal data. However, their use is highly debated when attrition may be due to death. While some authors consider that mixed model estimates are interpretable only in an immortal cohort, we show that their subject-specific interpretation still holds in the population currently alive, but their population-averaged interpretation is valid only in the immortal cohort. We propose an approximation of the population-averaged mean among the population alive that highlights the difference with the population-averaged mean in the immortal cohort. The interpretation of ML estimates of mixed models and joint models for the marker and the time-to-death as well as unweighted and weighted GEE of marginal models is then illustrated in a simulation study and in an application regarding cognitive decline in the elderly.

journal_name

Stat Methods Med Res

authors

Rouanet A,Helmer C,Dartigues JF,Jacqmin-Gadda H

doi

10.1177/0962280217723675

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

343-356

issue

2

eissn

0962-2802

issn

1477-0334

journal_volume

28

pub_type

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