joineRML: A joint model and software package for time-to-event and multivariate longitudinal outcomes

Hickey, Graeme Lee, Philipson, Pete, Jorgensen, Amanda and Kolamunnage-Dona, Ruwanthi (2018) joineRML: A joint model and software package for time-to-event and multivariate longitudinal outcomes. BMC Medical Research Methodology. ISSN 1471-2288 (In Press)

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Background: Joint modelling of longitudinal and time-to-event outcomes has received considerable attention over recent years. Commensurate with this has been a rise in statistical software options for fitting these models. However, these tools have generally been limited to a single longitudinal outcome. Here, we describe the classical joint model to the case of multiple longitudinal outcomes, propose a practical algorithm for fitting the models, and demonstrate how to fit the models using a new package for the statistical software platform R, joineRML.

Results: A multivariate linear mixed sub-model is specified for the longitudinal
outcomes, and a Cox proportional hazards regression model with time-varying
covariates is specified for the event time sub-model. The association between models is captured through a zero-mean multivariate latent Gaussian process. The models are fitted using a Monte Carlo Expectation-Maximisation algorithm, and inferences are based on approximate standard errors from the empirical profile information matrix, which are contrasted to an alternative bootstrap estimation approach. We illustrate the model and software on a real data example for patients with primary biliary cirrhosis with three repeatedly measured biomarkers.

Conclusions: An open-source software package capable of fitting multivariate joint models is available. The underlying algorithm and source code makes use of several methods to increase computational speed.

Item Type: Article
Uncontrolled Keywords: Joint modelling; Longitudinal data; Multivariate data; Time-to-event data; Software
Subjects: G300 Statistics
G400 Computer Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 21 May 2018 11:21
Last Modified: 21 May 2018 11:30

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