AUCtrap: Calculate AUC Using Trapezoidal Rule

In anikoszabo/AUCtrap: Calculate Area Under the Curve Using Trapezoidal Rule

Description

AUCtrap implements several methods for calculating the area under a piecewise linear function defined by longitudinally measured values of a variable.

Usage

AUCtrap(x, ...)

## Default S3 method:
AUCtrap(x, y, method = c("AUC", "iAUC", "netAUC", "minAUC"), ...)

## S3 method for class 'formula'
AUCtrap(formula, data, subset, na.action, ...)

Arguments

x	numeric vector giving the measurement times (x-values)
...	further arguments passed to methods
y	numeric vector with the measurements corresponding to x
method	character value defining the calculation method. Defaults to "AUC", which is the total area under the curve
formula	a formula of the form y ~ x where y is the measured response and x are the measurement times
data	an optional matrix or data frame containing the variables in formula. By default, the variables are taken from environment(formula).
subset	an optional vector specifying a subset of observations to be taken
na.action	a function which indicates what should happen when the data contain NAs. Defaults to getOption("na.action").

Details

The implemented methods are total AUC ("AUC"), incremental AUC measured from the first as baseline ("iAUC"), net AUC ("netAUC"), and AUC from the minimum as baseline ("minAUC").

Value

an object of class auctrap with the following elements

value

calculated area

x

sorted x values

y

y values sorted with x

method

calculation method

Examples

AUCtrap(0:3, c(3,4,1,2))

anikoszabo/AUCtrap documentation built on Dec. 19, 2021, 3:37 a.m.