5 papers
Network Security Modeling using NetFlow Data: Detecting Botnet attacks in IP Traffic
Ganesh Subramaniam, Huan Chen, Ravi Varadhan +1
Cybersecurity, security monitoring of malicious events in IP traffic, is an important field largely unexplored by statisticians. Computer scientists have made significant contribut…
SQUAREM: An R Package for Off-the-Shelf Acceleration of EM, MM and Other EM-like Monotone Algorithms
Yu Du, Ravi Varadhan
We discuss R package SQUAREM for accelerating iterative algorithms which exhibit slow, monotone convergence. These include the well-known expectation-maximization algorithm, majori…
Bayesian Bivariate Subgroup Analysis for Risk-Benefit Evaluation
Nicholas C. Henderson, Ravi Varadhan
Subgroup analysis is a frequently used tool for evaluating heterogeneity of treatment effect and heterogeneity in treatment harm across observed baseline patient characteristics. W…
Damped Anderson acceleration with restarts and monotonicity control for accelerating EM and EM-like algorithms
Nicholas C. Henderson, Ravi Varadhan
The expectation-maximization (EM) algorithm is a well-known iterative method for computing maximum likelihood estimates from incomplete data. Despite its numerous advantages, a mai…
Individualized Treatment Effects with Censored Data via Fully Nonparametric Bayesian Accelerated Failure Time Models
Nicholas C. Henderson, Thomas A. Louis, Gary L. Rosner +1
Individuals often respond differently to identical treatments, and characterizing such variability in treatment response is an important aim in the practice of personalized medicin…