NEWS

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gsynth 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.

gsynth 1.3.1 (2025-12-09)

• Updated DESCRIPTION and documentation.

gsynth 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.

gsynth 1.1.7

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

gsynth 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.

gsynth 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.

gsynth 1.0.8

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

gsynth 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.