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 doing following tast: > > First generate 100 Gaussion(3,1) numbers, then write the > likelihood function > to estimate the parameters of Gaussian distribution by direct > maximizing the > likelihood function. > > My likelihood function is: > >fn<-function(x) > >(-50*log((sd(x))^2))-50*log(sqrt(2*pi))-(1/2*((mean(x))^2))*( > sum((x-(mean(x))^2)) > > After I input above function, the '' >'' turned to be '' + > ''. and it did > not work. > > I am looking for the help to solve this tast by writting a likelihood > function. > > Thanks a lot. > > Best regards. > edward sun
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