find_peak: Find the peak date of an incidence curve

In reconhub/incidence: Compute, Handle, Plot and Model Incidence of Dated Events

Find the peak date of an incidence curve

Description

This function can be used to find the peak of an epidemic curve stored as an incidence object.

Usage

find_peak(x, pool = TRUE)

Arguments

x	An incidence object.
pool	If TRUE (default), any groups will be pooled before finding a peak. If FALSE, separate peaks will be found for each group.

Value

The date of the (first) highest incidence in the data.

Author(s)

Thibaut Jombart [e-mail], Zhian N. Kamvar [e-mail]

See Also

estimate_peak() for bootstrap estimates of the peak time

Examples

if (require(outbreaks) && require(ggplot2)) { withAutoprint({
  i <- incidence(fluH7N9_china_2013$date_of_onset)
  i
  plot(i)

  ## one simple bootstrap
  x <- bootstrap(i)
  x
  plot(x)

  ## find 95% CI for peak time using bootstrap
  find_peak(i)


  ## show confidence interval
  plot(i) + geom_vline(xintercept = find_peak(i), col = "red", lty = 2)

})}

reconhub/incidence documentation built on July 5, 2025, 5:41 a.m.