Changes in version 0.2.0 (2026-04-02)                  

  - Add detrend() and detrend_factor() functions to facilitate
    trend-adjusted staggered DiD modeling

                 Changes in version 0.1.1 (2026-01-14)                  

  - Excluded non-package directories from source bundle.
  - Fixed S3 method registration for print.summary.sdid_mdl.

                        Changes in version 0.1.0                        

  - Initial CRAN submission.