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Math Forum » Discussions » sci.math.* » sci.stat.math.independent

Topic: log normal?
Replies: 14   Last Post: Jan 1, 2013 6:17 AM

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A N Niel

Posts: 2,240
Registered: 12/7/04
Re: log normal?
Posted: Dec 27, 2012 7:32 AM
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In article
<83a604c5-c421-4ea2-90f1-a27942ee5fa6@n2g2000pbp.googlegroups.com>,
RichD <r_delaney2001@yahoo.com> 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

Theoretically, the range of a normal distribution is: all real numbers.
If we have some random quantity that cannot, by definition, be
negative, then of course its distribution cannot be normal. Sometimes
in those cases it turns out that log-normal distribution is a good
model.

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