Changes in version 1.0.0                        

  - Initial CRAN release.

  - Implements three estimation methods for time-invariant variables in
    panel FE models:
    
      - fevd(): Fixed Effects Vector Decomposition (Plümper &
        Troeger, 2007)
      - fef(): Fixed Effects Filtered (Pesaran & Zhou, 2018)
      - fef_iv(): FEF with instrumental variables (Pesaran & Zhou, 2018)

  - Uses correct Pesaran-Zhou (2018) variance estimators that account
    for generated regressor uncertainty.

  - Provides bw_ratio() diagnostic for between/within variance analysis.

  - Full S3 methods: print(), summary(), coef(), vcov(), confint().