From: Jinsong Zhao <jszhao_at_mail.hzau.edu.cn>

Date: Tue, 24 Jun 2008 18:51:06 +0800

R-help_at_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. Received on Tue 24 Jun 2008 - 11:12:33 GMT

Date: Tue, 24 Jun 2008 18:51:06 +0800

Another question related with the same code:

*> r <- c(3,4,4,3,5,4,5,9,8,11,12,13)
*

> n <- rep(15,12)

*> x <- c(0, 1.1, 1.3, 2.0, 2.2, 2.8, 3.7, 3.9, 4.4, 4.8, 5.9, 6.8)
**> x <- log10(x)
**> fr <- function(c, alpha, beta) {
**> P <- c + (1-c) * pnorm(alpha + beta * x)
**> P <- pmax(pmin(P,1),0)
**> -(sum(log(choose(n,r))) + sum(r * log(P)) + sum((n -r)* log(1-P)))
**> }
**> fit <- mle((fr), start = list(c =0.2, alpha = 0, beta =0.1), method =
**> "BFGS")
**>
*

Error in optim(start, f, method = method, hessian = TRUE, ...) :

initial value in 'vmmin' is not finite

Any suggestion? Thanks in advance!

Jinsong

R-help_at_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. Received on Tue 24 Jun 2008 - 11:12:33 GMT

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