Jonge, E. de, & Loo, M. van der. (2013). An Introduction to Data Cleaning with R. Retrieved from http://cran.r-project.org/doc/contrib/de_Jonge+van_der_Loo-Introduction_to_data_cleaning_with_R.pdf

重點是p7的那個流程圖，清楚的告訴你資料分析的流程。