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From |
Ari Samaranayaka <ari.samaranayaka@ipru.otago.ac.nz> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Skewness and kurtosis |

Date |
Tue, 17 Mar 2009 13:40:00 +1300 |

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

-- 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: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: Skewness and kurtosis***From:*Matt Spittal <Matt.Spittal@cancervic.org.au>

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