In article <firstname.lastname@example.org>, RichD <email@example.com> writes:
> Ocasionally I come across somethign called log > normal, and I wonder, what is the purpose? > The normal distribution is natural, but the log of that, > seems unnatural, and unintuitive. > > Can anyone elaborate on its use?
Basically, the normal distribution is natural for additive processes. Add n uniform-deviate random numbers together m times, make a histogram and you get the Gaussian, i.e. normal, distribution. The log normal distribution is the equivalent for processes which are not additive but multiplicative.