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From |
"Frederick Guy" <f.guy@bbk.ac.uk> |

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

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

Date |
Thu, 29 Apr 2010 19:15:12 +0100 |

Thanks, I guess I was unclear on this aspect of the problem. For each observation, the sum I'm talking about is of measurements made relative to all other observations (or more generally, to some set of other observations) in the sample. -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss Sent: 29 April 2010 19:09 To: statalist@hsphsun2.harvard.edu Subject: st: AW: Creating index relative to other observations <> ".. 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/ * * 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: RE: AW: Creating index relative to other observations***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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

**st: AW: Creating index relative to other observations***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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