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http://funyakofunyao.click/2018/11/11/%e3%80%90ggplot%e5%82%99%e5%bf%98%e9%8c%b2%e3%80%91%e6%a3%92%e3%82%b0%e3%83%a9%e3%83%95%e3%81%a7dodge%e3%81%a8stack%e3%81%a8%e3%82%92%e5%90%8c%e6%99%82%e3%81%ab%e8%a1%8c%e3%81%86%e6%96%b9%e6%b3%95/
【ggplot備忘録】棒グラフでdodgeとstackとを同時に行う方法