ggplot2 : Plot mean with geom_bar

问题:

I have the following data frame:

test2 

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.

回答1:

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") 

回答2:

ggplot2 likes 1 data point for 1 plot point. Create a new data frame with your summary statistics, then plot with stat="identity"

require(reshape2) plot.data 

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