Dear R users, I would like to estimate mu and sigma of a log-normal distribution, where I know that the expected value is 1, as it is a normalized distribution. That means as E(x) = exp (mu + 1/2*sigma^2) = 1 that 2*mu = -sigma^2 . Therefore I only need to fit one parameter either sigma or mu. How could I do this in R? Thank you very much for your help! biophil
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