T
trog_8
Member
Hi all,
I am getting myself confused with the lognormal distribution in this question and I was hoping someone would be able to help me.
I can understand why Ln(S4) follows a N(-15.697,50) distribution.
Now my current understanding is that S4 should then follow a LogNormal distribution with mean exp(mu + 0.5*sigma^2) and variance exp(2*mu +sigma^2)*(exp(sigma^2) - 1) where mu and sigma^2 are the mean and variance of Ln(S4) respectively.
However, the examiners report has S4 as having a mean of -15.697 and variance 50 which is equal to mu and sigma.
Following my understanding/method I get a S4 mean of 10,971.
Thanks
I am getting myself confused with the lognormal distribution in this question and I was hoping someone would be able to help me.
I can understand why Ln(S4) follows a N(-15.697,50) distribution.
Now my current understanding is that S4 should then follow a LogNormal distribution with mean exp(mu + 0.5*sigma^2) and variance exp(2*mu +sigma^2)*(exp(sigma^2) - 1) where mu and sigma^2 are the mean and variance of Ln(S4) respectively.
However, the examiners report has S4 as having a mean of -15.697 and variance 50 which is equal to mu and sigma.
Following my understanding/method I get a S4 mean of 10,971.
Thanks