Hello, I'd like to obtain parameters for my poisson data. Having made the function
poisregfun = function(a,b) {Y.pred = exp(a + b*x) - sum(dpois(y, lambda = Y.pred, log = TRUE))} where Y is a vector of data to be regressed on another vector x. I'm asking for mle2( poisregfun, start = list(a = 21, b = 0.7), method = "Nelder-Mead") Do I need more arguments than this? regards, Russell (computer replies with: 'Error in optim(par = c(21, 0.7), fn = function (p) : objective function in optim evaluates to length 20 not 1') [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.