User talk:Wjastle

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Hello, Wjastle! Welcome to Wikipedia! Thank you for your contributions to this free encyclopedia. If you decide that you need help, check out Getting Help below, ask me on my talk page, or place {{helpme}} on your talk page and ask your question there. Please remember to sign your name on talk pages by clicking Button sig.png or using four tildes (~~~~); this will automatically produce your username and the date. Finally, please do your best to always fill in the edit summary field. Below are some useful links to facilitate your involvement. Happy editing! Million_Moments (talk) 10:30, 27 June 2008 (UTC)
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Polygamma in Beta Distribution Higher Moments section[edit]

Wjastle,

Could you please double check your math?

Instead of your posted result:

\operatorname{E}(\log^2 X) = \psi^2(\alpha) - \psi^2(\alpha + \beta)+[\psi^{(1)}(\alpha)-\psi^{(1)}(\alpha+\beta)]^2,


I get:

\operatorname{E}(\log^2 X) = (\psi(\alpha) - \psi(\alpha + \beta))^2+\psi^{(1)}(\alpha)-\psi^{(1)}(\alpha+\beta),


same problem for the other result


Thanks,

Dr. J. Rodal (talk) 01:04, 11 August 2012 (UTC)

Yes you are right, I got the notation confused: mixed powers and orders of poly-gammas.

  • I just added "Should the Mean and the Variance based on Ln[X] (rather than X) be included in the statistical property box?" to the Beta Distribution talk page. It will be interesting to hear your views on this subject, and for our Wikipedia community to arrive at a consensus. Thanks Dr. J. Rodal (talk) 15:30, 11 August 2012 (UTC)