R Under development (unstable) (2012-07-27 r60013) -- "Unsuffered Consequences"

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> library(bbmle)

> d <- data.frame(x=0:10,

+ y=c(26, 17, 13, 12, 20, 5, 9, 8, 5, 4, 8))

>

> maxit <- 1000

> mle2(y~dpois(lambda=exp(lymax)/(1+x/exp(lhalf))),

+ start=list(lymax=0,lhalf=0),

+ data=d,

+ control=list(maxit=maxit),

+ parameters=list(lymax~1,lhalf~1))

Call:

mle2(minuslogl = y ~ dpois(lambda = exp(lymax)/(1 + x/exp(lhalf))),

start = list(lymax = 0, lhalf = 0), data = d, parameters = list(lymax ~

1, lhalf ~ 1), control = list(maxit = maxit))

Coefficients:

lymax lhalf

3.218853 1.117035

Log-likelihood: -28.6

>

> proc.time()

user system elapsed

0.708 1.004 1.572