[R] Estimating parameters of log-normal distribution

[Gunther Höning]

Dear list,

I have to vectors:

x <- rep(c(2,4,8,24,48,72),2)
y
<-c(82543,169105,207615,96633,31988,7005,82687,172931,205541,101842,31898,69
50)

that follows a log-normal function as

f(x)= SO/(sqrt(2*pi)*sigma *x) * exp(-(ln x - mu)^2/(2*sigma^2))

that is a log-normal distribution multiplied with SO.

How can I estimate SO, mu and sigma in R ?


Wishes 
Gunther