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Math Forum » Discussions » sci.math.* » sci.math.num-analysis.independent

Topic: log normal?
Replies: 10   Last Post: Jan 1, 2013 6:17 AM

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David Jones

Posts: 62
Registered: 2/9/12
Re: log normal?
Posted: Dec 27, 2012 6:11 AM
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"RichD" wrote in message
news:83a604c5-c421-4ea2-90f1-a27942ee5fa6@n2g2000pbp.googlegroups.com...

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

----------------------------------------------------------

It is not "log of that", it is the "exponential of that" ... that is, a
lognormal rv is the exponential of a normal rv.

If an observation has a lognormal distribution, the logarithm of the
observation has a normal distribution.

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