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我怎樣才能更有效地編寫下面的代碼(即少用幾行)?如何更有效地編寫下面的代碼?
我似乎無法定義一個函數與去年參數,並喜歡寫東西Data{Year} = read.csv('{Year}.csv')
或Data{Year}${Year+1} = 0
等等
## Load data ##
Data2011 = read.csv('2011.csv')
Data2012 = read.csv('2012.csv')
Data2013 = read.csv('2013.csv')
Data2014 = read.csv('2014.csv')
## Year dummies ##
Data2011$D2011 = 1
Data2011$D2012 = 0
Data2011$D2013 = 0
Data2011$D2014 = 0
Data2012$D2011 = 0
Data2012$D2012 = 1
Data2012$D2013 = 0
Data2012$D2014 = 0
Data2013$D2011 = 0
Data2013$D2012 = 0
Data2013$D2013 = 1
Data2013$D2014 = 0
Data2014$D2011 = 0
Data2014$D2012 = 0
Data2014$D2013 = 0
Data2014$D2014 = 1