ZoppoT

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Hello ZoppoT! Welcome to Wikipedia! Thank you for your contributions. 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 someone will show up shortly to answer your questions. Please remember to sign your name on talk pages by clicking or using four tildes (~~~~); this will automatically produce your name 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! DrMicro (talk) 00:08, 13 February 2013 (UTC) Getting Started Wikipedia Tutorial • The five pillars of Wikipedia How to: edit a page • upload an image Getting Help Frequently Asked Questions Where to ask questions or make comments Request administrator attention Policies and Guidelines Neutral point of view • Reliable sources Verifiability • Citing sources • No original research What Wikipedia is not • Biographies of living persons Manual of Style • Three-revert rule • Sock puppetry Copyrights • Fair use • Image use policy External links • Spam • Vandalism Deletion policy • Conflict of interest • Notability The Community Build consensus • Resolving disputes Assume good faith • Civility • Etiquette No personal attacks • No legal threats Community Portal • Village pump Signpost • IRC channels • Mailing lists Things to do Be bold in editing • Help develop an article Pages needing attention • Peer review Join a WikiProject • Translating articles Cleaning up: General • Spam • Vandalism Miscellaneous Categories • Disambiguity • Stubs User pages • Talk pages Useful templates • Tools • User scripts

Re bimodal

I have checked this formula in places other than the one you cited. Thank you for your correction. DrMicro (talk) 00:10, 13 February 2013 (UTC)

Actually on reviewing the formula this is more complex. This depends on the definition of the kurtosis. Some defintions give the kurtosis of the normal distribution as 0 while others give it as 3. This is where the different formulae come in. The article probably needs both formulae with proper explanations as to which to use. DrMicro (talk) 00:13, 13 February 2013 (UTC)

Thank you for the link. I had read that paper before. I think most of the material in it is now on WP.

There is clearly a need to specify exactly what type of kurtosis is being used in the formula. I am inclined to agree with you over a correction factor to the skewness but I don't think anyone has studied the effect of introducing a finite correction factor into the formula. Without that I would be reluctant to alter this one or to propose a new one.

I now remember trying to decide which formula to use in the article. The literature is very confusing on this point. I chose the version that uses the usual measure of kurtosis rather than the one that uses the excess kurtosis. I probably should check which one gives the right value for the unimodal distraibution before I change (or do not change) anything on that page. DrMicro (talk)

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