Tools for Autoregressive Conditional Duration Models R package ACDm version 1.1.0 Provides tools for autoregressive conditional duration (ACD, Engle and Russell, 1998) models. Functions to create trade, price, or volume durations from transaction data, perform diurnal adjustments, fit various ACD models, and test them. Software Depends: R(>= 3.0.2) Imports: broom, dplyr, ggplot2, graphics, numDeriv, plyr, Rcpp, Rsolnp, zoo LinkingTo: Rcpp(>= 0.12.10) Suggests: optimx, rgl, Markus Belfrage <markus.belfrage@gmail.com> Comprehensive R Archive Network (CRAN) Markus Belfrage [aut, cre] GPL (>= 3) 2025-07-16 application/tgz https://CRAN.R-project.org/package=ACDm doi:10.32614/CRAN.package.ACDm