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Re: Definition of skewness [message #45111 is a reply to message #45110]

Fri, 12 August 2005 08:52

mchinand
Messages: 66
Registered: September 1996

Member

In article <k-bowman-6A23C8.09010712082005@news.tamu.edu>,
Kenneth Bowman <k-bowman@null.tamu.edu> wrote:
>
> The documentation is incorrect. Skewness is related to the third moment about
> the mean.
>
> It would be extremely helpful if the IDL manuals included the mathematical
> expressions for quantities such as this, but unless they receive many requests,
> RSI is unlikely to update the docs.
>

While the SKEWNESS page does have the incorrect description, it does at least mention that
it calls the MOMENT function and its help page does give the mathematical expression for
skewness (3rd moment about mean as Ken stated above). That's still no excuse for having the
wrong description of skewness, however.

--Mike

--
Michael Chinander
m-chinander@uchicago.edu
Department of Radiology
University of Chicago

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[Message index]

		Re: Definition of skewness By: JD Smith on Fri, 12 August 2005 13:41
		Re: Definition of skewness By: mchinand on Fri, 12 August 2005 09:30
		Re: Definition of skewness By: David Fanning on Fri, 12 August 2005 08:59
		Re: Definition of skewness By: mchinand on Fri, 12 August 2005 08:52
		Re: Definition of skewness By: K. Bowman on Fri, 12 August 2005 07:01

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