Density plot in ggplot2 using log scale

Question

I'd like to use ggplot2 density geometry using a log transformation for the x scale:

qplot(rating, data=movies, geom="density", log="x")

This, however, produces a chart with probabilities larger than 1. One solution that seems to work is to scale the dataset before calling qplot:

qplot(rating, data=transform(movies, rating=log(rating))

But then the x axis doesn't look nice. What is the correct way to handle this?

It seems that my question doesn't not, in fact, make sense. It seems that it is OK that probability densities are larger than one, as per [2]. What is important is that the integral over the entire space is equal to one [3].

Luciano Selzer · Accepted Answer · 2011-06-13 15:42:38Z

3

This gives the right answer.

qplot(rating, y = ..scaled.., data=movies, geom="density", log="x")

stat_density produces new values, one of them is ..scaled.. which is the density scaled from 0 to 1. example plot

HTH

answered Jun 13, 2011 at 15:42

Luciano Selzer

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