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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Sum over all possible combinations |

Date |
Sun, 22 Jul 2007 18:41:24 +0100 |

This sounds like number in group * Gini mean difference * 2 As the second L-moment is Gini mean difference / 2 -lmoments- from SSC will get you most of the way there. For example, lmoments varname, by(group) gen(n=n sad=l2) replace sad = 4 * n * l2 Check this out with hand-calculations for a toy example. Nick n.j.cox@durham.ac.uk Julio E > I am interested in computing the sum of the absolute value of > all possible > differences within a group of my sample. > > Suppose that the variable "group" denotes the variable > indicating the group > to which an individual belongs and Y is an outcome variable. > I am interested > in computing > > sum of abs (Yi-Yj) for all i and j belonging to group K > > My programming skills are almost none. Can somebody help me > out regarding an > efficient way of computing such statistic? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Sum over all possible combinations***From:*"J E" <je_123@hotmail.com>

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