Package: nonabsdid
Type: Package
Title: Visualize Heterogeneity-Robust Event Studies for Non-Absorbing
        Treatments
Version: 0.4.1
Date: 2026-06-23
Authors@R: c(
    person(given = "Takuma",
           family = "Iwasaki",
           role = c("aut", "cre"),
           email = "iwasakit@stanford.edu",
           comment = c(ORCID = "0009-0000-8782-4851"))
    )
Description: 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.
License: MIT + file LICENSE
Encoding: UTF-8
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
Config/testthat/edition: 3
URL: https://github.com/takuma1102/nonabsdid,
        https://takuma1102.github.io/nonabsdid/
BugReports: https://github.com/takuma1102/nonabsdid/issues
VignetteBuilder: knitr
Additional_repositories: https://rpolars.r-universe.dev
Config/roxygen2/version: 8.0.0
NeedsCompilation: no
Packaged: 2026-06-23 07:21:40 UTC; 81809
Author: Takuma Iwasaki [aut, cre] (ORCID:
    <https://orcid.org/0009-0000-8782-4851>)
Maintainer: Takuma Iwasaki <iwasakit@stanford.edu>
Repository: CRAN
Date/Publication: 2026-06-23 08:50:08 UTC
Built: R 4.5.3; ; 2026-07-01 04:39:22 UTC; windows
