Changes in version 0.5.4 (2021-08-13)                  

  - Corrected CRAN errors.

                 Changes in version 0.5.3 (2019-11-26)                  

  - Fix an error in CovEst.2010OAS.

                 Changes in version 0.5.2 (2019-08-29)                  

  - Function list is moved to README file.
  - Following functions are added - CovEst.2003LW, CovEst.2010OAS,
    CovEst.2010RBLW.

                 Changes in version 0.5.1 (2019-01-29)                  

  - Functions for hypothesis tests are separated for clarity.
  - Initialize the following documentation:
      - NEWS for keeping record of updates.
      - README to briefly introduce the method.