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fn_t
2009 Sep 24
1
Maximum likelihood estimation of parameters make no biological sense
R-help,
I'm trying to estimate some parameters using the Maximum Likehood method.
The model describes fish growth using a sigmoidal-type of curve:
fn_w <- function(params) {
Winf <- params[1]
k <- params[2]
t0 <- params[3]
b <- params[4]
sigma <- params[5]
what <- Winf * (1-exp(- k *(tt - t0)))^b
logL <- -sum(dnorm(log(wobs),log(what),sqrt(s...