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http://funyakofunyao.click/2018/07/27/%e3%80%90r%e5%82%99%e5%bf%98%e9%8c%b2%e3%80%91ggplot%e3%81%a7%e6%a8%aa%e8%bb%b8%e3%81%8c%e9%80%a3%e7%b6%9a%e5%80%a4%e3%81%aegeom_bar%e3%82%92%e3%81%86%e3%81%be%e3%81%8fstack%e3%81%a7%e3%81%8d%e3%81%aa/
【R備忘録】ggplotで横軸が連続値のgeom_barをうまくstackできない