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xshi0001

xshi0001

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R- line regression
Getting and Cleaning Data- WeeK3- quiz
R- split-apply-combine (exercise)
R:data summary
R:Adding and Replacing Columns
r排序问题
R- group and subset data
Getting and Cleaning Data- Week2 contents and quiz
Getting and Cleaning Data- Week1 contents and quiz
R programming WEEK4
二项分布
Profiling R code
R : Lexical Scoping