The stats_ functions in ggplot2 create special variables, e.g. stat_bin2d
creates a special variable called ..count..
. Where can I find documentation listing which special variables are returned by which stat_ function?
I've looked on the main ggplot2 documentation pages, and in R online help. I tried reading the source code for stat_bin2d, but it uses bits of the language I don't understand -- I don't know how to get at the code behind StatBin2d$new(...)
.
Most of them are documented in the value section of the help pages, e.g., ?stat_boxplot
says
Value:
A data frame with additional columns:
width: width of boxplot
ymin: lower whisker = smallest observation greater than or equal to lower hinge - 1.5 * IQR
lower: lower hinge, 25% quantile
notchlower: lower edge of notch = median - 1.58 * IQR / sqrt(n)
middle: median, 50% quantile
notchupper: upper edge of notch = median + 1.58 * IQR / sqrt(n)
upper: upper hinge, 75% quantile
ymax: upper whisker = largest observation less than or equal to upper hinge + 1.5 * IQR
I suggest submitting bug reports for those that remain undocumented. There is a bug report for stat_bin2d
, but it was closed as fixed. If you create a new bug report you can refer to that one.
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