Nothing
library(bbmle)
old_opts <- options(digits=3)
x <- 0:10
y <- c(26, 17, 13, 12, 20, 5, 9, 8, 5, 4, 8)
d <- data.frame(x,y)
suppressWarnings(fits <- lapply(c("optim","nlm","nlminb"),
mle2,
minuslogl=y~dpois(lambda=ymax/(1+x/xhalf)),
start=list(ymax=15,xhalf=6),data=d,
method="Nelder-Mead")) ## 'method' is ignored by nlm()/nlminb()
sapply(fits,coef)
sapply(fits,logLik)
(fit2 <- mle2(y~dpois(lambda=25/(1+x/xhalf)),
start=list(xhalf=5),data=d,
lower=2,upper=8,
optimizer="optimize"))
## gives error referring to 'interval' rather than 'upper'/'lower'
## (fit2 <- mle2(y~dpois(lambda=25/(1+x/xhalf)),
## start=list(xhalf=5),
## optimizer="optimize"))
options(old_opts)
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