drc (version 1.2-0)

boltzmann: The Boltzmann model

Description

The Boltzmann model for dose-response relationships.

Usage

boltzmann(fixed = c(NA, NA, NA, NA, NA), names = c("b", "c", "d", "e", "f"))

  B.3(fixed = c(NA, NA, NA), names = c("b", "d", "e"))

  B.4(fixed = c(NA, NA, NA, NA), names = c("b", "c", "d", "e"))
  
  B.5(fixed = c(NA, NA, NA, NA, NA), names = c("b", "c", "d", "e", "f"))

Arguments

fixed

numeric vector. Specifies which parameters are fixed and at what value they are fixed. NAs for parameter that are not fixed.

names

a vector of character strings giving the names of the parameters (should not contain ":"). The order of the parameters is: b, c, d, e, f (see under 'Details').

Value

• An object containing with all components needed in multdrc.

Details

The model is also called the logistic model (different from the log-logistic model!).

Examples

## Fitting the Boltzmann model
m1 <- multdrc(ryegrass, fct = boltzmann())
summary(m1)

## Fitting an asymmetric Boltzmann model
##  requires installing the package 'NISTnls'
# m2 <- drm(y~x, data = Ratkowsky3, 
# fct = b5(fixed = c(NA, 0, NA, NA, NA)))
# plot(m2)
# summary(m2)  
## okay agreement with NIST values
##  for the two parameters that are the same