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http://funyakofunyao.click/2017/12/24/r-for-data-science-%e3%81%ae%e4%be%8b%e9%a1%8c%e3%82%92%e8%a7%a3%e3%81%8fchapter3/
R for Data Science の例題を解く - Chapter3 データ可視化