Hi,
when I write the likelihood function as
fn-function(x) -50*log(2*pi)-100*log(sigma)-(1/2*(sum((x-mu)/sigma)^2))
then what should I do since it shows that Error in log(sigma) : Object
sigma not found.
Thanks
edward
From: Edward Sun
Dear Sir/Madam,
I am using R version 1.8.1. I am
Edward -
Either optim() or fitdistr() has an additional required
argument which specifies the names (and incidentally starting
values) for the parameters to be estimated. Did you supply
that argument ? See help(optim), help(fitdistr).
- tom blackwell - u michigan medical school -
Have you worked through the posting guide at the end of each
r-help email? In particular, have you worked the examples in
help('fitdistr') in library MASS and optim?
hope this helps. spencer graves
Edward Sun wrote:
Hi,
when I write the likelihood function as
fn-function(x)
Do:
library(mle)
?mle
and read the documentation and the example. That should get you on the
right track.
Andy
From: Edward Sun
Hi,
when I write the likelihood function as
fn-function(x)
-50*log(2*pi)-100*log(sigma)-(1/2*(sum((x-mu)/sigma)^2))
then what should I do since it
Is this a homework problem?
The + means the statement is not syntactically complete.
Perhaps you have more ( than )?
Also, have you read the posting guide!
http://www.R-project.org/posting-guide.html;? Many people answer their
own questions just following that guide.
