[R] ggplot2 Pareto plot (Barplot in decreasing frequency)

[Morten]

Hi all

I have a large dataframe with (among others) a categorical variable of 52
levels and would like to create a barplot with the bars ordered in
decreasing frequency of the levels. I belive it is referred to as a pareto
plot. 

Consider a subset where I keep only the categorical variable in question.

# Example: 
v1 =  c("aa", "cc", "bb", "bb", "cc", "bb")  
df = data.frame(v1=v1) 

# How can I tell ggplot to sort the bars? 
# First bar = "bb" (3), second bar "cc" (2) and third bar "aa" (1) 
# with 52 levels in the real data frame (many with equal counts)
# and other similar variables, I hope it is possible to script this
efficiently

ggplot(df) + geom_bar(aes(v1)) 

Thank you in advance

Morten
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