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Changelog

Source: NEWS.md

undidR 3.0.2

  • Computation of HCCMEs is now faster by using a crossproduct approach rather than constructing a full omega matrix.
  • Changed the default HCCME from HC3 to HC1 (i.e., hc = 1).
  • Fixed an issue where standard errors were returning NA for certain edge cases.

undidR 3.0.1

CRAN release: 2026-02-16

  • Added the lwd and legend parameters to the S3 plot() method for UnDiDObj which controls line width and legend locations, respectively. Removed the default titles of plots.
  • Also made other minor aesthetic changes to the default plots, such as adding horizontal bars to the ends of the event study plot confidence bands (like the letter I).
  • Removed “none” as an aggregation option for staggered adoption.

undidR 3.0.0

CRAN release: 2026-01-26

  • Added new aggregation methods for staggered adoption: "sgt", "time", and "none".

    • "sgt" computes subaggregate ATTs for each treatment-time and post-treatment period pair, further separated by silo.
    • "time" computes subaggregate ATTs grouped by time since treatment.
    • "none" skips subaggregate ATT computation and directly computes the aggregate ATT from the underlying differences.

  • undid_stage_three() now returns an object of class UnDiDObj, providing a unified S3 interface.

  • Added support for event study plots via the plot() method for UnDiDObj objects.

  • Added randomization inference p-values for subaggregate ATTs.

  • Fixed a miscalculation of jackknife standard errors and p-values.

  • Expanded weighting options for ATT computation: "none", "diff", "att", and "both".

    • "diff" applies weights when computing subaggregate ATTs.
    • "att" applies weights when aggregating subaggregate ATTs.
    • "both" applies weighting at both stages.
    • "none" disables weighting entirely.

undidR 2.0.0

CRAN release: 2025-05-31

  • start_time and end_time columns are now stored as strings in the format specified by date_format column in the empty_diff_df CSV file.
  • Fixed as.Date() calls in undid_stage_two(), undid_stage_three(), and plot_parllel_trends() to ensure compatability for R versions 4.0.0 and onwards.

undidR 1.0.2

CRAN release: 2025-04-27

  • Made compatible for R versions 4.0.0 onwards.

undidR 1.0.1

CRAN release: 2025-02-24

  • Fixed the miscalculation of standard weights during stage two under common adoption scenarios.

undidR 1.0.0

CRAN release: 2025-01-23

  • Initial CRAN submission.
  • Updated installation instructions.

undidR 0.1.0

  • Initial development version (not yet submitted to CRAN).
  • Provides a framework for implementing difference-in-differences with unpoolable data.