R 환경 구축 https://cran.r-project.org/ https://www.rstudio.com/ 저자 URL facebook : www.facebook.com/hellodatascience blog : www.hellodatascience.com facebook2 : www.facebook.com/group/livingdata github https://github.com/jykim/dbook QS http://quantifiedself.com Reference https://en.wikipedia.org/wiki/Missing_data https://www.kaggle.com/competitions OECD - https://data.oecd.org 국가 통계 포털 - http://kosis.kr