说明：Thumbs up -Sentiment Classi_cation using Machine Learning techniques
说明：Cody's Data Cleaning Techniques Using SAS (Second Edtion)
说明：SAS.Publishing.Codys.Data.Cleaning.Techniques.Using.SAS_netbks.com
说明：A Handbook of Statistical Analyses Using R
说明：A Primer in Biological Data Analysis and Visualization Using R-Columbia Universi
说明：Advanced Topics in Analysis of Economic and Financial Data Using R
说明：Advances in Social Science Research Using R
说明：Analysis of Time Series Data Using R
说明：Applied Statistics Using SPSS, STATISTICA, MATLAB and R, Springer (2007)
说明：Comparing Groups Randomization and Bootstrap Methods Using R