bbmle (version 0.7.7)

parnames: get and set parameter names

Description

Gets and sets the "parnames" attribute on a negative log-likelihood function

Usage

parnames(obj)
parnames(obj) <- value

Arguments

obj

a negative log-likelihood function

value

a character vector of parameter names

Value

• Returns the parnames attribute (a character vector of parameter names) or sets it.

Details

The parnames attribute is used by mle2() when the negative log-likelihood function takes a parameter vector, rather than a list of parameters; this allows users to use the same objective function for optim() and mle2()

Examples

x <- 1:5
set.seed(1001)
y <- rbinom(5,prob=x/(1+x),size=10)
mfun <- function(p) {
  a <- p[1]
  b <- p[2]
  -sum(dbinom(y,prob=a*x/(b+x),size=10,log=TRUE))
}
optim(fn=mfun,par=c(1,1))
parnames(mfun) <- c("a","b")
mle2(minuslogl=mfun,start=c(a=1,b=1),method="Nelder-Mead")