auc: Compute the area under the curve for two vectors

In wayneliuq/wmisc: Wayne's Misc Helper Function

Description

Compute the area under the curve using linear or natural spline interpolation for two vectors where one corresponds to the x values and the other corresponds to the y values. This function wraps the function from the package "MESS".

Usage

auc(
  x,
  y,
  from = min(x, na.rm = TRUE),
  to = max(x, na.rm = TRUE),
  type = c("linear", "spline"),
  absolutearea = FALSE,
  subdivisions = 100,
  ...
)

Arguments

x	a numeric vector of x values
y	a numeric vector of y values of the same length as x
from	The value from where to start calculating the area under the curve. Defaults to the smallest x value.
to	The value from where to end the calculation of the area under the curve. Defaults to the greatest x value.
type	The type of interpolation. Defaults to "linear" for area under the curve for linear interpolation. The value "spline" results in the area under the natural cubic spline interpolation.
absolutearea	A logical value that determines if negative areas should be added to the total area under the curve. By default the auc function subtracts areas that have negative y values. Set absolutearea=TRUE to _add_ the absolute value of the negative areas to the total area.
subdivisions	an integer telling how many subdivisions should be used for integrate (for non-linear approximations)
...	additional arguments passed on to approx (for linear approximations). In particular rule can be set to determine how values outside the range of x is handled.

Examples

x <- 1:8
set.seed(10); y <- rnorm(8)
auc(x, y)

wayneliuq/wmisc documentation built on Dec. 23, 2021, 5:08 p.m.