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

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

Subject |
st: RE: Panel data. Multiple variables generation. |

Date |
Fri, 18 Dec 2009 20:00:48 +0100 |

<> You want to look at the -sum()- function, but deeper answers require an excerpt of your data. You can condition within the argument to the function, as seen here: ******* clear* set obs 10 gen num=_n gen var=rnormal()<.5 gen runningsum=sum(var) gen runningsumodd=sum(var*mod(_n,2)) list, noo ab(20) ******* If you want a constant sum, look at -egen, total()-... HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Laia Cirera i Crivillé Sent: Freitag, 18. Dezember 2009 19:50 To: statalist@hsphsun2.harvard.edu Subject: st: Panel data. Multiple variables generation. Good afternoon, I am working with a panel data set, which contains data on bilateral trade flows for 103 countries and for 9 periods of time (t), where (i) are exporting countries and (j) are importing countries . For each pair of trading countries (ij), and for each period of time (t), I have the variable Yijt. I need to create a new variable (Xit), which, for each case where country (i) is exporting and for each period of time (t), will add Yijt terms up. For example, if country i=1 and t=1 (X11), to obtain X11, I take each case of period t=1 where country 1 is exporting (i=1), and add all Yijt terms up. If country i=2 and and t=1 (X12), I take each case of period t=1 where country 2 is exporting (i=2), and add all Yijt terms up. So Xit will vary by exporting country(i) and period of time(t), but will be the same across bilateral pair of countries (ij) which have the same exporter country (i) and period of time (t). Do you know which command I should use? Thanks a lot. Laia _________________________________________________________________ ¡Ya está aquí Windows Live Spaces! Ahora podrás crear fácilmente tu propio sitio Web. http://spaces.live.com/signup.aspx * * 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**:**FW: st: RE: Panel data. Multiple variables generation.***From:*Laia Cirera i Crivillé <laiacirera16@hotmail.com>

**RE: st: RE: Panel data. Multiple variables generation.***From:*Laia Cirera i Crivillé <laiacirera16@hotmail.com>

**References**:**st: Panel data. Multiple variables generation.***From:*Laia Cirera i Crivillé <laiacirera16@hotmail.com>

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