Relative potency function — relpot • drc

Calculates and optionally plots relative potency as a function of the response level for two curves in a dose-response model, using EDcomp for the underlying comparisons.

Usage

relpot(
  object,
  plotit = TRUE,
  compMatch = NULL,
  percVec = NULL,
  interval = "none",
  type = c("relative", "absolute"),
  scale = c("original", "percent", "unconstrained"),
  ...
)

Arguments

object: an object of class 'drc'.
plotit: logical. If TRUE (default), a plot of relative potency against response level is produced.
compMatch: a numeric vector of length 2 specifying which two curves to compare.
percVec: numeric vector of response levels at which to evaluate relative potency. If NULL, a suitable range is determined automatically.
interval: character string specifying confidence interval type. Default is "none".
type: character string. Either "relative" (default) or "absolute" response levels.
scale: character string. One of "original" (default), "percent", or "unconstrained".
...: additional graphical arguments passed to plot.

Value

An invisible list with components x, y (relative potency values), and percVec.

Author

Christian Ritz