Changepoint confidence interval geom

Draws horizontal whiskers for changepoint-location confidence intervals (e.g. from MOSUM, stepR, strucchange, segmented).

Usage

geom_cpt_ci(mapping = NULL, data = NULL, ..., na.rm = FALSE, show.legend = NA)

Arguments

mapping

Aesthetic mappings. Requires y (the height at which to draw the whisker) together with xmin and xmax. An x aesthetic is accepted but not needed: the layer is a horizontal error bar, so the interval is given by xmin/xmax and the changepoint itself is usually marked with a separate point layer, as autoplot(show_ci = TRUE) does.

data

A data frame with CI information.

...

Other arguments passed to geom_errorbarh.

na.rm

If FALSE, missing values are removed.

show.legend

Whether to show legend.

Value

A ggplot layer.

See also

Other ggplot2 layers: geom_changepoint(), geom_cpt_event(), geom_cpt_label(), geom_cpt_region(), geom_cpt_segment(), stat_changepoint()

Examples

library(ggplot2)
set.seed(2026)
d <- data.frame(t = 1:100, y = c(rnorm(50), rnorm(50, 4)))
ci <- data.frame(xmin = 45, xmax = 56, y = 0)
ggplot(d, aes(t, y)) + geom_line() +
  geom_cpt_ci(aes(xmin = xmin, xmax = xmax, y = y), data = ci,
              inherit.aes = FALSE, width = 0.4, colour = "blue")