Assurance Methods for Clinical Trials with a Delayed Treatment Effect R package DTEAssurance version 1.1.0 Provides functions for planning clinical trials subject to a delayed treatment effect using assurance-based methods. Includes two 'shiny' applications for interactive exploration, simulation, and visualisation of trial designs and outcomes. The methodology is described in: Salsbury JA, Oakley JE, Julious SA, Hampson LV (2024) "Assurance methods for designing a clinical trial with a delayed treatment effect" <doi:10.1002/sim.10136>, Salsbury JA, Oakley JE, Julious SA, Hampson LV (2024) "Adaptive clinical trial design with delayed treatment effects using elicited prior distributions" <doi:10.48550/arXiv.2509.07602>. Software Depends: R (>= 4.1.0) Imports: SHELF, shiny, stats, survival, nleqslv, nph, nphRCT, dplyr, rjags, rpact, magrittr, rlang, future.apply Suggests: testthat (>= 3.0.0) James Salsbury <jsalsbury1@sheffield.ac.uk> Comprehensive R Archive Network (CRAN) James Salsbury [aut, cre] (ORCID: <https://orcid.org/0000-0002-2584-3640>) MIT + file LICENSE (https://CRAN.R-project.org/package=DTEAssurance/LICENSE) 2025-12-02 application/tgz https://CRAN.R-project.org/package=DTEAssurance doi:10.32614/CRAN.package.DTEAssurance