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並前往https://www.povertyactionlab.org/sites/default/files/r-cheat-sheet.pdf

r-cheat-sheet.pdf - Poverty Action Lab

Base R. Cheat Sheet. RStudio® is a trademark of RStudio, ... Read and write an R data file, a ... df <- data.frame(x = 1:3, y = c('a', 'b', 'c')).

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