Talk:U-quadratic distribution

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SOCR UCLA

This article is similar to http://wiki.stat.ucla.edu/socr/index.php/UQuadraticDistribuionAbout but it seems the other may have come first by a day. See [1] November 5, 2007 and [2] November 6, 2007. Same contributor? --Rumping (talk) 11:08, 1 September 2010 (UTC)[reply]

The value is given as a positive multiple of (b-a)^4

1. It should not have b-a in it; b-a is a scale parameter but kurtosis (and hence excess kurtosis) is scale free.

2. The given value is positive, but the excess kurtosis for this distribution is (plainly) negative.

3. It looks like the value given in the sidebar is probably the fourth central moment, not excess kurtosis.