Article first published online: 2 SEP 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Statistics in Medicine
Volume 32, Issue 6, pages 978–994, 15 March 2013
How to Cite
Stock, S. and DeGruttola, V. (2013), Recursive partitioning for monotone missing at random longitudinal markers. Statist. Med., 32: 978–994. doi: 10.1002/sim.5574
- Issue published online: 14 FEB 2013
- Article first published online: 2 SEP 2012
- Manuscript Accepted: 28 JUL 2012
- Manuscript Revised: 13 JUL 2012
- Manuscript Received: 19 NOV 2010
- NIH. Grant Numbers: AI R01 51164, AI T32 007358
- inverse probability weighting;
- recursive partitioning;
The development of HIV resistance mutations reduces the efficacy of specific antiretroviral drugs used to treat HIV infection and cross-resistance within classes of drugs is common. Recursive partitioning has been extensively used to identify resistance mutations associated with a reduced virologic response measured at a single time point; here we describe a statistical method that accommodates a large set of genetic or other covariates and a longitudinal response. This recursive partitioning approach for continuous longitudinal data uses the kernel of a U-statistic as the splitting criterion and avoids the need for parametric assumptions regarding the relationship between observed response trajectories and covariates. We propose an extension of this approach that allows longitudinal measurements to be monotone missing at random by making use of inverse probability weights. We assess the performance of our method using extensive simulation studies and apply them to data collected by the Forum for Collaborative HIV Research as part of an investigation of the viral genetic mutations associated with reduced clinical efficacy of the drug abacavir. Copyright © 2012 John Wiley & Sons, Ltd.