r - How to get a barplot with several variables side by side grouped by a factor -


i have dataset looks 1 below. trying make barplot grouping variable gender, variables side side on x axis (grouped gender filler different colors), , mean values of variables on y axis (which represents percentages)

tea                coke            beer             water           gender 14.55              26.50793651     22.53968254      40              1 24.92997199        24.50980392     26.05042017      24.50980393     2 23.03732304        30.63063063     25.41827542      20.91377091     1    225.51781276       24.6064623      24.85501243      50.80645161     1 24.53662842        26.03706973     25.24271845      24.18358341     2

in end want barplot enter image description here

any suggestions how that? made searches find examples factors on x axis, not variables grouped factor. appreciated!

you can use aggregate calculate means:

means<-aggregate(df,by=list(df$gender),mean) group.1      tea     coke     beer    water gender 1       1 87.70171 27.24834 24.27099 37.24007      1 2       2 24.73330 25.27344 25.64657 24.34669      2

get rid of group.1 column

means<-means[,2:length(means)]

then have reformat data in long format:

library(reshape2) means.long<-melt(means,id.vars="gender")   gender variable    value 1      1      tea 87.70171 2      2      tea 24.73330 3      1     coke 27.24834 4      2     coke 25.27344 5      1     beer 24.27099 6      2     beer 25.64657 7      1    water 37.24007 8      2    water 24.34669

finally, can use ggplot2 create plot:

library(ggplot2) ggplot(means.long,aes(x=variable,y=value,fill=factor(gender)))+   geom_bar(stat="identity",position="dodge")+   scale_fill_discrete(name="gender",                       breaks=c(1, 2),                       labels=c("male", "female"))+   xlab("beverage")+ylab("mean percentage")

enter image description here


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