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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: AW: Creating index relative to other observations |

Date |
Thu, 29 Apr 2010 20:09:24 +0200 |

<> ".. sum up the results of these computations,". Creating sums can mean different things in Stata. It may sound trite, but the easiest is simply to -generate- a sum by adding values with a "+" sign. If you want the total of a variable, look at -egen, total()-. If you want a running sum, take a look at -help sum()-. HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Frederick Guy Gesendet: Donnerstag, 29. April 2010 19:52 An: statalist@hsphsun2.harvard.edu Betreff: st: Creating index relative to other observations I have need to use information from all observations (about 1800 of them) to create a new variable. The variable created is a weighted sum of the inverse of geographical distances between observation i and all j n.e. i. I have longitude and latitude for each observation, and computation of the distance from any i to any j is straightforward. What I don't know is how to get Stata to loop over all observation and sum up the results. For every observation i, I think I need to (a) loop through all j n.e. I, doing computations involving variables x1, x2(i) and x1, x2(j), and then (b) sum up the results of these computations, returning a value which becomes variable x3 for that i. I expect there's a straightforward way to do this. Any suggestions? Frederick Guy Senior Lecturer Department of Management School of Business, Economics, and Infomatics Birkbeck College, University of London Malet St London WC1E 7HX * * 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/ * * 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/

**Follow-Ups**:**st: RE: AW: Creating index relative to other observations***From:*"Frederick Guy" <f.guy@bbk.ac.uk>

**References**:**st: Creating index relative to other observations***From:*"Frederick Guy" <f.guy@bbk.ac.uk>

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