Geek Answers Handbook

Ggplot errorbar position multi-factor issues

I am trying to build standard error columns over a layered data histogram that is very similar to the following:

mth<-rep(c("June","July","August"),length.out=15) yr<-rep(c("1999","2000","2005","2009","2010"),each=3) X<-rnorm(15,mean=200,sd=100) lng<-rep(c(30,31,31),length.out=15) vrnc<-rnorm(15,mean=740,sd=300) df<-data.frame(mth,yr,vrnc,lng,X) dfi<-dim(df)[1] for(i in 1:dfi){ df$X.se[i]<-sqrt(df$vrnc[i]/df$lng[i]) }

I tried to place error bars using the stat_summary method described in this thread . My code with stat_summary looks like this:

 ggplot(df,aes(x=yr,y=X,fill=mth))+ stat_summary(fun.y=mean, geom="bar",position=position_dodge(1)) + stat_summary(fun.ymin=min,fun.ymax=max,geom="errorbar", color="grey40",position=position_dodge(1), width=.2) + geom_errorbar(data=df,aes(ymin=XX.se,ymax=X+X.se,position="dodge",width=.2))+ scale_fill_discrete("mth")

I also tried using this code:

 ggplot(df,aes(x=yr,y=X,fill=mth))+ geom_bar(stat="identity",position="dodge")+ geom_errorbar(data=df,aes(ymin=XX.se,ymax=X+X.se,position="dodge",width=.2))

but the result is always displayed with errors in the middle of each year.

enter image description here

I would like to know what I am doing wrong. Each error line should be at the top of the month / year indicated in the data.

+5
source share
1 answer

had to do it recently. sort of:

 ggplot(df,aes(x=yr,y=X,fill=mth))+ geom_bar(stat="identity", position = position_dodge()) + geom_errorbar(aes(ymin=XX.se, ymax=X+X.se), position = position_dodge(.9), width=.2)
+6
source

More articles:


All Articles