Re: st: Skewness and kurtosis

[Ari Samaranayaka <ari.samaranayaka@ipru.otago.ac.nz>]

Matt
Thank you very much. That answered my question.
Ari

Matt Spittal wrote:
> Dear Ari,
>
> I presume that you are referring to the formulas using the -summarize-
> command.  These are given in the manual [R] Q-Z on page 371 for Stata 10.
> Briefly, if
>
> m_r = /frac{1}{n} /sum_{i = 1}^n w_i (x_i - /bar{x})^r
>
> then the coefficient of skewness is m_3 m_2 ^{-3/2} and the coefficient of
> kurtosis is m_4 m_2 ^{-2}.
>
> -- Matt
> matt.spittal@cancervic.org.au
>
>
>
> On 17/3/09 10:52 AM, "Ari Samaranayaka" <ari.samaranayaka@ipru.otago.ac.nz>
> wrote:
>
>   
> > Dear statalist,
> > Can someone tell me the exact formulas used by Stata to calculate
> > skewness and kurtosis. This question is because several types of
> > skewness and kurtosis are defined in literature, and the terminology and
> > notation are not consistent.
> > Thanks
> > Ari
> >     
>
> *
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>
>
>   


--
Dr. Ari Samaranayaka
IPRU
Dept of Preventive and Social Medicine
University of Otago
Dunedin, New Zealand
(03) 479 7168
http://www.otago.ac.nz/ipru/

*
*   For searches and help try:
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*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/