title: Dimension reduction in the linear model for right-censored data: predicting the change of HIV-I RNA levels using clinical and protease gene mutation data.
abstract: With rapid development in the technology of measuring disease characteristics at molecular or genetic level, it is possible to collect a large amount of data on various potential predictors of the clinical outcome of interest in medical research. It is often of interest to effectively use the information on a large number of predictors to make prediction of the interested outcome. Various statistical tools were developed to overcome the difficulties caused by the high-dimensionality of the covariate space in the setting of a linear regression model. This paper focuses on the situation, where the interested outcomes are subjected to right censoring. We implemented the extended partial least squares method along with other commonly used approaches for analyzing the high-dimensional covariates to the ACTG333 data set. Especially, we compared the prediction performance of different approaches with extensive cross-validation studies. The results show that the Buckley-James based partial least squares, stepwise subset model selection and principal components regression have similar promising predictive power and the partial least square method has several advantages in terms of interpretability and numerical computation.
authors.affiliation: Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, 680 N. Lake Shore, Suite 1102, Chicago, Illinois 60611, USA. jjhuang@northwestern.edu
authors.forename: Jie
authors.initials: J
authors.lastname: Huang
authors.forename: David
authors.initials: D
authors.lastname: Harrington
mesh_terms: D015658:HIV Infections / Q000453:epidemiology*; D016333:HIV Protease / Q000235:genetics*; D006679:HIV Seropositivity / Q000453:epidemiology; D015497:HIV-1 / Q000302:isolation & purification*; D006801:Humans; D016014:Linear Models; D009154:Mutation; D016133:Polymerase Chain Reaction; D011237:Predictive Value of Tests; D012367:RNA, Viral / Q000032:analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D012367:RNA, Viral; D016333:HIV Protease