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http://funyakofunyao.click/2018/01/07/%e3%80%90r%e5%82%99%e5%bf%98%e9%8c%b2%e3%80%91%e9%a0%86%e5%ba%8f%e4%bb%98%e3%81%8d%e3%82%ab%e3%83%86%e3%82%b4%e3%83%aa%e5%a4%89%e6%95%b0%e3%81%ae%e9%a0%86%e5%ba%8f%e3%82%92%e9%80%86%e8%bb%a2/
【R備忘録】カテゴリ変数(factor、因子)の順序を逆転させる