Changes in version 2025-06-05                      

    o   Added dialog boxes for collecting responses to questions.

    o   Added help file.

    o   Modified help file.

    o   Modified DESCRIPTION.

                     Changes in version 2024-05-21                      

    o   Modified function.

    o   Modified DESCRIPTION.

    o   Modified help file.

                     Changes in version 2024-03-06                      

    o   Added help files.

    o   Modified appearances of dialog boxes.

    o   Modified function names.

                     Changes in version 2023-12-06                      

    o   Modified dialog boxes for fitting model and calculating WTP.

                     Changes in version 2023-03-11                      

    o   Modified dialog box for fitting model.

                     Changes in version 2020-11-02                      

    o   First release to CRAN.