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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1968

Title: A local influence sensitivity analysis for incomplete longitudinal depression data
Authors: Shen, Shuyi Y.
Beunckens, Caroline
Mallinckrodt, Craig
Molenberghs, Geert
Issue Date: 2006
Abstract: In the analyses of incomplete longitudinal clinical trial data, there has been a shift, away from simple ad hoc methods that are valid only if the data are missing completely at random (MCAR), to more principled (likelihood-based or Bayesian) ignorable analyses, which are valid under the less restrictive missing at random ( MAR) assumption. The availability of the necessary standard statistical software allows for such analyses in practice. Although the possibility of data missing not at random (MNAR) cannot be ruled out, it is argued that analyses valid under MNAR are not well suited for the primary analysis in clinical trials. Therefore, rather than either forgetting about or blindly shifting to an MNAR framework, the optimal place for MNAR analyses is within a sensitivity analysis context. Such analyses can be used, for example, to assess how sensitive results from an ignorable analysis are to possible departures from MAR and how much results are affected by influential observations. In this article, we apply the local influence sensitivity tool (Verbeke et al., 2001) to a longitudinal depression trial, thereby applying it to continuous outcomes from clinical trials.
Notes: Hasselt Univ, Ctr Stat, Hasselt, Belgium. Eli Lilly & Co, Indianapolis, IN 46285 USA.Beunckens, C, Hasselt Univ, Ctr Stat, Hasselt, Belgium.caroline.beunckens@uhasselt.be
URI: http://hdl.handle.net/1942/1968
DOI: 10.1080/10543400600609510
ISI #: 000237604900012
ISSN: 1054-3406
Category: A1
Type: Journal Contribution
Validation: ecoom, 2007
Appears in Collections: Research publications

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