setting boxplot x-axis positions

[Nick S]

Hi,

I have data with progressively fewer observations as x increases. I've constructed boxplot with breaks based on quantiles of the data so that I have roughly the same number of observations per box, thus the bin widths become steadily larger. When I plot the boxplot, the boxes are all placed right next to each other (since they are factors), but this obscures the bin width differences, and the underlying break locations. How can I space out the boxes so that, say, the left breakpoint of each corresponds to the location on the x-axis in cartesian coordinates?

Thank you in advance for your help,

Nick

[Winston Chang]

I'm not sure this is what you're looking for, but you can use a continuous x axis for box plots, if you specify grouping.

set.seed(111)

dat <- data.frame(x=rnorm(50,sd=1.5)^2, y= rnorm(50))

ggplot(dat,aes(x=x,y=y)) + geom_boxplot(aes(group=floor(sqrt(x)))) + 

    geom_point(shape=19)

One drawback is that the width of each box is the width of the actual data, which can be smaller than the group size. I don't know if there's a way around this.

-Winston

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[Nick S]

Thank you, Winston, your suggestion got me on the right track!