Density plot in ggplot2 using log scale

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. O开发者_如何学JAVAne 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?

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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].

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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.

HTH