geom_stratum receives a dataset of the horizontal (
x) and vertical (
ymax) positions of the strata of an alluvial plot. It plots
rectangles for these strata of a provided
geom_stratum( mapping = NULL, data = NULL, stat = "stratum", position = "identity", show.legend = NA, inherit.aes = TRUE, width = 1/3, na.rm = FALSE, ... )
Set of aesthetic mappings created by
aes(). If specified and
inherit.aes = TRUE (the default), it is combined with the default mapping
at the top level of the plot. You must supply
mapping if there is no plot
The data to be displayed in this layer. There are three options:
NULL, the default, the data is inherited from the plot
data as specified in the call to
data.frame, or other object, will override the plot
data. All objects will be fortified to produce a data frame. See
fortify() for which variables will be created.
function will be called with a single argument,
the plot data. The return value must be a
will be used as the layer data. A
function can be created
~ head(.x, 10)).
The statistical transformation to use on the data; override the default.
Position adjustment, either as a string naming the adjustment
"jitter" to use
position_jitter), or the result of a call to a
position adjustment function. Use the latter if you need to change the
settings of the adjustment.
logical. Should this layer be included in the legends?
NA, the default, includes if any aesthetics are mapped.
FALSE never includes, and
TRUE always includes.
It can also be a named logical vector to finely select the aesthetics to
FALSE, overrides the default aesthetics,
rather than combining with them. This is most useful for helper functions
that define both data and aesthetics and shouldn't inherit behaviour from
the default plot specification, e.g.
Numeric; the width of each stratum, as a proportion of the distance between axes. Defaults to 1/3.
FALSE, the default,
NA lodes are not included;
NA lodes constitute a separate category,
plotted in grey (regardless of the color scheme).
Additional arguments passed to
geom_stratum understand the
following aesthetics (required aesthetics are in bold):
group is used internally; arguments are ignored.
The previously defunct parameters
ribbon_bend have been
ggplot2::layer() for additional arguments and
stat_stratum() for the corresponding stat.
Other alluvial geom layers:
# full axis width ggplot(as.data.frame(Titanic), aes(y = Freq, axis1 = Class, axis2 = Sex, axis3 = Age, axis4 = Survived)) + geom_stratum(width = 1) + geom_text(stat = "stratum", aes(label = after_stat(stratum))) + scale_x_discrete(limits = c("Class", "Sex", "Age", "Survived")) # use of facets ggplot(as.data.frame(Titanic), aes(y = Freq, axis1 = Class, axis2 = Sex)) + geom_flow(aes(fill = Survived)) + geom_stratum() + geom_text(stat = "stratum", aes(label = after_stat(stratum))) + scale_x_discrete(limits = c("Class", "Sex")) + facet_wrap(~ Age, scales = "free_y")