Changes in version 0.3.5 (2021-08-13) - Fixed potential CRAN issues. Changes in version 0.3.4 (2020-05-07) - Added a NEWS.md file to track changes to the package. - Graphic parameter settings are corrected. - est.LG now uses K=2 as default value. Changes in version 0.3.3 (2019-11-25) - Change maintainer's contact information. - More examples are clarified. Changes in version 0.3.2 (2019-05-10) - Error fixed in gmodel.P (Zifeng Zhao at Notre Dame). - Sampling procedures are tuned to statistics literature. Changes in version 0.3.1 (2019-02-03) - Error fixed in nd.smooth (Li Chen at Notre Dame). - Documentaion is initiated.