Changes in version 1.0.2 (2026-03-23)                  

  - Replaced options(warn = -1) with suppressWarnings() in internal
    helper silent_ebalance() for CRAN compliance (avoids global state
    modification).

                        Changes in version 0.2.0                        

  - Initial public release.
  - Implements six estimation methods: ols1, ols2, did, ebal, ipw, aipw.
  - Supports robust, bootstrap, and jackknife variance estimation.
  - Parallel computation via foreach/doParallel for bootstrap and
    jackknife.
  - fdid_prepare() for reshaping long-format panel data.
  - fdid_list() for comparing multiple estimates.
  - S3 methods: print, summary, plot for fdid and fdid_list objects.
  - Built-in mortality dataset (Cao et al. 2022, China Great Famine).
  - Reference: Xu, Zhao & Ding (2026) doi:10.1080/01621459.2026.2628343.