geometric mean

["Jaume" <jaguado@medicina.ub.es>]

I know that this question is not new but I haven't seen the answer yet. How
could I compute the standard deviation of the geometric mean with S-Plus?.
Is there a function to do it? Is it correct to work with the log-data and
then make the antilog of the confidence interval limits?.

Thank you.

PD: this is my first post. Spanish undergraduate student. So sorry about my
english.