Published by the Foundation for Open Access Statistics Editors-in-chief: Bettina Grün, Torsten Hothorn, Edzer Pebesma, Achim Zeileis    ISSN 1548-7660; CODEN JSSOBK
Authors: Chenguang Wang, Elizabeth Colantuoni, Andrew Leroux, Daniel O. Scharfstein
Title: idem: An R Package for Inferences in Clinical Trials with Death and Missingness
Abstract: In randomized controlled trials of seriously ill patients, death is common and often defined as the primary endpoint. Increasingly, non-mortality outcomes such as functional outcomes are co-primary or secondary endpoints. Functional outcomes are not defined for patients who die, referred to as "truncation due to death", and among survivors, functional outcomes are often unobserved due to missed clinic visits or loss to follow-up. It is well known that if the functional outcomes "truncated due to death" or missing are handled inappropriately, treatment effect estimation can be biased. In this paper, we describe the package idem that implements a procedure for comparing treatments that is based on a composite endpoint of mortality and the functional outcome among survivors. Among survivors, the procedure incorporates a missing data imputation procedure with a sensitivity analysis strategy. A web-based graphical user interface is provided in the idem package to facilitate users conducting the proposed analysis in an interactive and user-friendly manner. We demonstrate idem using data from a recent trial of sedation interruption among mechanically ventilated patients.

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Paper: idem: An R Package for Inferences in Clinical Trials with Death and Missingness     Download PDF (Downloads: 158)
idem_5.0.tar.gz: R source package Download (Downloads: 9; 580KB)
v93i12.R: R replication code Download (Downloads: 13; 5KB)
abc.tsv: Supplementary data (TSV format) Download (Downloads: 10; 4KB)

DOI: 10.18637/jss.v093.i12

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Paper: Creative Commons Attribution 3.0 Unported License
Code: GNU General Public License (at least one of version 2 or version 3) or a GPL-compatible license.