我想在ggplot中制作一个带有sd的条形图。数据文件是:
mtc<-mtcars
head(mtc)
mpg cyl disp hp drat wt qsec vs am gear carb
Mazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4
Datsun 710 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1
Hornet 4 Drive 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1
Hornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 0 0 3 2
Valiant 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1
我使用tapply计算变量wt的mean和sd
meanwt=tapply(mtc$wt, mtc$gear, mean)
sd=tapply(mtc$wt, mtc$gear, sd)
我使用错误栏
创建ggplotggplot(mtc, aes(x=gear, y=wt, fill=vs)) +
geom_bar(position=position_dodge(), stat="identity") +
geom_errorbar(aes(ymin=meanwt-sd, ymax=meanwt+sd),
width=.2, position=position_dodge(.9))
我收到此错误
Error: Aesthetics must either be length one, or the same length as the dataProblems:meanwt - sd, meanwt + sd
答案 0 :(得分:0)
我发现了问题,谢谢!
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