Changes in version 1.4.0 (2026-03-27)                  

  - Breaking change: The estimator parameter now maps directly to
    estimation methods. estimator = "gsynth" (new default) uses the
    generalized synthetic control method (Xu 2017); estimator = "ife"
    uses the IFE-EM algorithm (Gobillon & Magnac 2016); estimator = "mc"
    uses matrix completion (Athey et al. 2021). The legacy EM = TRUE
    parameter is equivalent to estimator = "ife" when estimator is not
    explicitly specified.
  - Fixed loadings plot warnings from GGally::ggpairs (upstream fix in
    fect).
  - Replaced pkgdown vignette with Quarto book tutorial.
  - Updated DESCRIPTION: added BugReports, Encoding, GitHub URL.

                 Changes in version 1.3.1 (2025-12-09)                  

  - Updated DESCRIPTION and documentation.

                        Changes in version 1.3.0                        

We merged all functionalities of gsynth into the package fect. gsynth is
now a wrapper of fect. Please check fect User Manual for updates. We
maintain gsynth solely for backward compatibility.

                        Changes in version 1.1.7                        

Using normal approximation instead of the percentile method to obtain
confidence intervals based on bootstrapped standard errors.

                        Changes in version 1.1.4                        

1.  Import function felm from lfe to fit two-way fixed effects model as
    the starting value for estimation of interactive fixed effects model
    with unbalanced panel data.
2.  Add cluster bootstrap option for uncertainty estimates.
3.  Add jackknife uncertainty estimates.
4.  Add a new function cumuEff for calculation of sub-group and
    cumulative treatment effects.

                 Changes in version 1.0.9 (2018-08-24)                  

1.  Function panelView() is removed from gsynth and becomes an
    independent package panelview.
2.  Implement the matrix completion method.
3.  Fix bugs.
4.  Change the color scheme.

                        Changes in version 1.0.8                        

1.  Add a function panelView() to visualize raw data and data structure
    before estimation.
2.  Fix bugs.

                        Changes in version 1.0.7                        

1.  Add "implied weights" of control units for each treated unit to the
    output of the main function (wgt.implied).
2.  Add a plot to visualize missing data and treatment status (type =
    "missing").
3.  Accommodate unbalanced panels.