Visualize Heterogeneity-Robust Event Studies for Non-Absorbing Treatments R package nonabsdid version 0.4.1 Runs several heterogeneity-robust difference-in-differences (DID) event-study estimators for non-absorbing (i.e., treatment can switch on and off over time, allowing treatment reversal) binary treatments through their respective packages, harmonizes their output onto a common time axis and tidy data structure, and overlays them in a single 'ggplot2' panel for visual comparison. Supported estimators include those provided by 'DIDmultiplegtDYN', 'PanelMatch', and 'fect', with an optional naive two-way fixed-effects reference series via 'fixest'. The underlying methods are respectively described in Clement de Chaisemartin and Xavier D'Haultfoeuille. "Difference-in-Differences Estimators of Intertemporal Treatment Effects." The Review of Economics and Statistics (2026) <doi:10.1162/rest_a_01414>, Kosuke Imai, In Song Kim, and Erik H. Wang. "Matching methods for causal inference with time‐series cross‐sectional data." American Journal of Political Science 67.3 (2023) <doi:10.1111/ajps.12685>, Licheng Liu, Ye Wang, and Yiqing Xu. "A practical guide to counterfactual estimators for causal inference with time‐series cross‐sectional data." American Journal of Political Science 68.1 (2024) <doi:10.1111/ajps.12723>, and Laurent R. Bergé, Kyle Butts, and Grant McDermott. "Fast and user-friendly econometrics estimations: The R package 'fixest'." arXiv preprint (2026) <doi:10.48550/arXiv.2601.21749>. A single nabs_event_study() wrapper runs any supported estimator with a common interface; nabs_event_study_simple() provides a one-line front door for quick exploratory runs; the S3 generic as_nabs_event_study() coerces estimator output into a tidy stable schema; and nabs_event_plot() overlays multiple methods on a single 'ggplot2' panel, with optional naive two-way fixed effects drawn in a neutral color as a reference. Software Depends: R (>= 4.1.0) Imports: cli, dplyr, ggplot2, rlang, stats, tibble Suggests: DIDmultiplegtDYN, polars, PanelMatch, fect, fixest, haven, knitr, rmarkdown, testthat (>= 3.0.0), vdiffr, withr Takuma Iwasaki <iwasakit@stanford.edu> Comprehensive R Archive Network (CRAN) Takuma Iwasaki [aut, cre] (ORCID: <https://orcid.org/0009-0000-8782-4851>) MIT + file LICENSE (https://CRAN.R-project.org/package=nonabsdid/LICENSE) 2026-06-23 application/tgz https://CRAN.R-project.org/package=nonabsdid doi:10.32614/CRAN.package.nonabsdid