ggplot2:用geom_bar表示平均值 [英] ggplot2 : Plot mean with geom_bar
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问题描述
我有以下数据框:
test2 < - data.frame(groups = c(rep(group1 4),rep(group2,4)),
X2 = c(rnorm(4),rnorm(4)),
label = c(rep(1,2),rep (2,2),代表(1,2),代表(2,2)))
我绘制每个组的每个标签的条形图:
ggplot(test2,aes(label,X2,fill = as.factor(groups)))+
geom_bar(position =dodge,stat =identity)
I have the following data frame:
test2 <- data.frame(groups = c(rep("group1",4), rep("group2",4)),
X2 = c(rnorm(4), rnorm(4)) ,
label = c(rep(1,2),rep(2,2),rep(1,2),rep(2,2)))
and I am plotting the bar graphs for each label per group using:
ggplot(test2, aes(label, X2, fill=as.factor(groups))) +
geom_bar(position="dodge", stat="identity")
However, I am cannot seem to be able to find a stat="mean"
so I can plot the means on each bar graph instead of the identity.
Thanks for any help.
解决方案
simply use stat = "summary"
and fun.y = "mean"
ggplot(test2) +
geom_bar(aes(label, X2, fill = as.factor(groups)),
position = "dodge", stat = "summary", fun.y = "mean")
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