Convert a time series from the original scale to an index for ggplot2
stat_index(mapping = NULL, data = NULL, geom = "line", position = "identity", show.legend = NA, inherit.aes = TRUE, index.ref = NULL, index.basis = 100, ...)
- 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
mappingif there is no plot mapping.
- The data to be displayed in this layer. There are three
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
fortifyfor which variables will be created.
functionwill be called with a single argument, the plot data. The return value must be a
data.frame., and will be used as the layer data.
- The geometric object to use display the data
- Position adjustment, either as a string, or the result of a call to a position adjustment function.
- logical. Should this layer be included in the legends?
NA, the default, includes if any aesthetics are mapped.
FALSEnever includes, and
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.
- if not NULL, a vector of integers indicating which elements of the beginning of each series to use as a reference point for converting to an index. If NULL, no conversion takes place and the data are presented on the original scale.
- if index.ref is not NULL, the basis point for converting to an index, most commonly 100 or 1000. See examples.
- other arguments for the geom
ap_df <- tsdf(AirPassengers) ggplot(ldeaths_df, aes(x = YearMon, y = deaths, color = sex)) + stat_index(index.ref = 1:12, index.basis = 1000) + ylab("Deaths index\n(average of first 12 months = 1000")