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http://hdl.handle.net/1942/13637
Title: | Analysing intensive longitudinal data after summarization at landmarks: an application to daily pain evaluation in a clinical trial | Authors: | Bunouf, P. Grouin, Jean-Marie MOLENBERGHS, Geert Koch, G. |
Issue Date: | 2012 | Publisher: | WILEY-BLACKWELL | Source: | JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES A-STATISTICS IN SOCIETY, 175 (2), p. 513-534 | Abstract: | The paper addresses some of the key issues to be considered in analysing intensive longitudinal data after summarization at scheduled landmarks (i.e. prespecified times). In this context, the derivation of outcomes requires rigorous rules and the selection of covariates should be based on a thorough data exploration. To guide the choice of statistical approaches for inferences, we study the missingness mechanism by using a specific dropout model. Then, we compare and contrast statistical approaches based on direct modelling and on multiple imputation applied either to the raw data or to the derived outcomes. The results are interpreted in the light of the model constraints and the missingness mechanism assumption. We show that some statistical approaches based on multiple imputation applied to the raw data are particularly well adapted to our context as they avoid any loss of available information for missing data imputation. We also show that the influence of subjects with incomplete profiles can be described by using individual estimations given by appropriate statistical models. The motivating data set was collected in a double-blind placebo-controlled clinical trial to assess the effect on pain of a new compound in subjects suffering from fibromyalgia. | Notes: | [Bunouf, P.] Lab Pierre Fabre, Dept Stat, F-31319 Labege, France. [Grouin, J. -M.] Univ Rouen, F-76821 Mont St Aignan, France. [Molenberghs, G.] Univ Hasselt, Diepenbeek, Belgium. [Molenberghs, G.] Katholieke Univ Leuven, Louvain, Belgium. [Koch, G.] Univ N Carolina, Chapel Hill, NC USA. | Keywords: | Social Sciences; Mathematical Methods; Statistics & Probability; electronic diary; intensive longitudinal data; longitudinal outcome analysis; mixed model; multiple imputation;Electronic diary; Intensive longitudinal data; Longitudinal outcome analysis; Mixed model; Multiple imputation | Document URI: | http://hdl.handle.net/1942/13637 | ISSN: | 0964-1998 | e-ISSN: | 1467-985X | DOI: | 10.1111/j.1467-985X.2011.01014.x | ISI #: | 000301535600010 | Rights: | © 2011 Royal Statistical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2013 |
Appears in Collections: | Research publications |
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bunouf 1.pdf Restricted Access | Published version | 1.17 MB | Adobe PDF | View/Open Request a copy |
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