get and set parameter names
Gets and sets the "parnames" attribute on a negative log-likelihood function
parnames(obj) parnames(obj) <- value
obj |
a negative log-likelihood function |
value |
a character vector of parameter names |
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()
Returns the parnames attribute (a character vector of
parameter names) or sets it.
Ben Bolker
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")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.