Ordering bars in barplot()

Question

I have a dataframe, and one of the variables (let\'s call it Q1) has several levels: \"No use\", \"30 min\", \"1 hour\", \"2 hours\", \"3+ hours\".

How can I plot a barp

Answer 1

One possibility is to create a factor version of Q1 where you specify the levels in the desired order:

df$Q1_fac <- factor(df$Q1, levels = c("30 min", "1 hour",  "2 hours", "3+ hours"))

tt <- table(df$Q1_fac)
tt
# Q1_fac
# 30 min   1 hour  2 hours 3+ hours 
#      2        4        3        4    

barplot(tt)