Changes in version 0.2.2 (2023-11-29)                  

  - Use string literals when calling R internal function error() for
    error messaging.

                 Changes in version 0.2.1 (2018-08-24)                  

  - Requires scclust 0.2.0 to fix erroneous error message.

                 Changes in version 0.2.0 (2018-08-21)                  

  - Makes defaults and error messages friendlier with discrete
    covariates
      - Changes so matching_weights returns zero for unassigned units.

                 Changes in version 0.1.3 (2018-07-21)                  

  - Adds function for covariate averages.
      - Updates maintainer information.

                 Changes in version 0.1.2 (2017-05-20)                  

  - Initial release.