no code implementations • 17 Oct 2021 • Zhale Nowroozilarki, Arash Pakbin, James Royalty, Donald K. K. Lee, Bobak J. Mortazavi
Electronic Health Record (EHR) systems provide critical, rich and valuable information at high frequency.
1 code implementation • 23 Mar 2021 • Arash Pakbin, Xiaochen Wang, Bobak J. Mortazavi, Donald K. K. Lee
Modern applications of survival analysis increasingly involve time-dependent covariates.
1 code implementation • ICML 2020 • Xiaochen Wang, Arash Pakbin, Bobak J. Mortazavi, Hongyu Zhao, Donald K. K. Lee
BoXHED 1. 0 is a novel tree-based implementation of the generic estimator proposed in Lee, Chen, Ishwaran (2017), which was designed for handling time-dependent covariates in a fully nonparametric manner.
no code implementations • 27 Jan 2017 • Donald K. K. Lee, Ningyuan Chen, Hemant Ishwaran
Given functional data from a survival process with time-dependent covariates, we derive a smooth convex representation for its nonparametric log-likelihood functional and obtain its functional gradient.
no code implementations • 30 Oct 2016 • Ningyuan Chen, Donald K. K. Lee, Sahand Negahban
Exploiting the fact that most arrival processes exhibit cyclic behaviour, we propose a simple procedure for estimating the intensity of a nonhomogeneous Poisson process.