On Thursday, December 27, 2012 12:00:07 AM UTC-5, RichD wrote: > 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? > > > > -- > > Rich
We frequently do analyses on the length of stay of certain groups of hospital patients. When graphed, they usually come out as a "log normal distribution"; do a google image search on that term and you'll see what it looks like. When we take the logs of the values, the distribution becomes a more normal distribution, allowing the standard statistical tests.