R help - Aug 2010 - Lognormal distribution - Range Factor

Hi, What does it mean to say Lognormal distribution with a mean of 1.03E-6
with a range factor of 100 ? How can I find the lognormal distribution
paramters from this information?

Thanks, Tims

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On 01-Aug-10 10:59:03, Tims Corbett wrote:
> Hi, What does it mean to say Lognormal distribution with a mean of
> 1.03E-6 with a range factor of 100 ? How can I find the lognormal
> distribution paramters from this information?
> 
> Thanks, Tims
If you can, please say what is meant by "range factor". I have seen
it used to denote the ratio maximum/minimum for a sample, but it
might be intended to mean something else in the context of your
question.

If it does mean that, then the context is a sample of values, deemed
to be log-normally distributed, with (presumably) the sample mean
equal to 1.03E-6 (0.00000103) and max/min=100. However this would
be really inadequate information to determine what the parameters
of the log-normal distribution might be. At the very least one needs
also the sample size, and even then the determination would not be
reliable.

Ted.

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E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
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Date: 01-Aug-10                                       Time: 12:33:45
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Thanks Ted,
> I came across this "range factor" in the context of Bayesian
analysis:
>
> The range factor of the lognormal distribution was fixed to 100 which
> provides a very broad distribution and might be regarded as slightly
> informative prior.
>
> This is all I have about the jargon.
> Tims.
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