Changes in version 1.4.9                        

  - Added .Deprecated() wrappers to 13 legacy function names (e.g.,
    makeBalancedPanel, rhs.vars). The old names remain fully functional
    but now emit deprecation warnings; removal is planned for a future
    version.
    
      - Fixed bug in rhs() where it was internally calling the
        deprecated rhs.vars() instead of rhs_vars(), causing spurious
        deprecation warnings
    
      - Fixed bug in panel2cs2() where outcomes could shift across unit
        boundaries in unbalanced panels when balance_panel = FALSE
    
      - Updated license from GPL-2 to GPL-3
    
      - Updated minimum R version from 3.1.0 to 4.1.0
    
      - Moved caret from Imports to Suggests; it is only required for
        drop_collinear() and will prompt a clear error if not installed
    
      - Added @importFrom data.table .N .SD in place of @import
        data.table to reduce namespace pollution
    
      - Added roxygen2 examples to many previously undocumented exported
        functions
    
      - Expanded test suite with coverage for panel utilities,
        distribution functions, weighted statistics, formula utilities,
        and Rcpp functions

                 Changes in version 1.4.8 (2025-02-04)                  

  - added function weighted_combine_list for computing weighed averages
    of a list of matrices or vectors
    
      - modernized function names to snake case, keeping older function
        names available as internal functions

                 Changes in version 1.4.7 (2025-01-10)                  

  - moved functions t2orig and orig2t to BMisc from pte package
    
      - add function drop_collinear to drop collinear columns from a
        matrix
    
      - add function get_principal_components to get unit-specific
        principal components of time-varying variables
    
      - add function time_invariant_to_panel for repeating
        time-invariant variables, mainly with the idea of adding them
        into a panel data set
    
      - update get_group to allow for non-binary treatments
    
      - add function check_staggered to check if a panel data set has
        staggered treatment adoption, this function can work with
        non-binary treatments

                 Changes in version 1.4.6 (2024-03-09)                  

  - Adds functions get_group, get_YiGmin1, and get_Yi1 as utility
    functions for manipulating data. This is especially useful for
    settings with staggered treatment adoption.
    
      - Add functions get_lagYi and get_first_difference as more utility
        functions for working with panel data.
    
      - Add function get_Yit which recovers outcomes in period t for all
        units in a panel.
    
      - Restore default of makeBalancedPanel to return a data.frame
        rather than a data.table. New function argument
        return_data.table allows for returning a data.table if this is
        the desired functionality from the user.
    
      - Fixes documentation NOTE in id2rownum

                 Changes in version 1.4.5 (2022-07-11)                  

  - only execute examples for subsample and blockBootSample if plm
    package is available (thanks Achim Zeileis)

                 Changes in version 1.4.4 (2022-01-26)                  

  - faster version of panel2cs2 (thanks Kyle Butts)

                 Changes in version 1.4.3 (2021-12-09)                  

  - added Rcpp multiplier_bootstrap function
    
      - added TorF function, a vectorized version of isTRUE
    
      - allow for additional arguments in combineDfs function

                 Changes in version 1.4.2 (2020-12-18)                  

  - changed package maintainer contact information
    
      - added source_all function

                 Changes in version 1.4.1 (2020-04-01)                  

  - added getElementList function

                        Changes in version 1.4.0                        

  - removed dependency on plm and formula.tools
    
      - add function blockBootSample for block bootstrapping with panel
        data
    
      - add option in makeDist to force the values of the distribution
        function be between 0 and 1

                 Changes in version 1.3.1 (2018-08-15)                  

  - Update rhs.vars to fix bug related to formulas like y~x+I(x^2)
    
      - Update toformula to allow for no right hand side variables

                 Changes in version 1.3.0 (2018-07-16)                  

  - Added function \code{invertEcdf} to take distribution functions
    (ecdf objects) and turn them into step functions for the quantiles.

  - Improved code for working with formulas

                 Changes in version 1.2.0 (2018-02-27)                  

  - Added function \code{subsample} for obtaining a subsample of a panel
    data set

                        Changes in version 1.1.0                        

  - Added function addCovToFormla which adds covariate(s) to a
    particular formula

                 Changes in version 1.0.1 (2017-06-14)                  

  - Removed dependency on qte package