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From |
"Austin Nichols" <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: creating a new variable? |

Date |
Fri, 17 Aug 2007 14:42:34 -0400 |

Marilyn-- There is a relevant FAQ: http://www.stata.com/support/faqs/data/members.html I think Jeph's solution does not get the Y you wanted, and will not work if there is more than one observation per state/birthstate combination (I'm not clear on whether this is true of your actual data or not). You might try this type of approach instead: clear input state birthstate total X Y 1 2 5 4 1 2 2 3 6 6 3 2 1 8 5 4 2 0 9 6 1 3 6 22 13 2 3 7 21 12 3 3 9 19 19 4 3 6 22 13 end egen bstot=sum(total), by(birthstate) egen sbstot=sum(total), by(state birthstate) g x=bstot-sbstot g teq=total if state==birthstate egen sametot=sum(teq), by(birthstate) replace sametot=0 if state==birthstate g y=bstot-sbstot-sametot drop bstot sbstot teq sametot li, noo clean On 8/17/07, Jeph Herrin <junk@spandrel.net> wrote: > Correction: > > bys birthstate: egen x=total(total) > replace x=x-total > gen y=x > replace y=y-total if state==birthstate > > > Jeph > > > Ms. Marilyn Ibarra wrote: > >> Any help would be greatly appreciated! Thanks! > >> I have the following variables: state, born, and total. I would like > >> to create two new variables: x and y. > >> I would like "X" and "Y" to be the sum of Total for certain > >> observations. Such as this: > >> state birthstate total "X" "Y" > >> 1 3 6 7+9+6 7+6 > >> 2 3 7 6+9+6 6+6 > >> 3 3 9 6+7+6 6+7+6 > >> 4 3 6 6+7+9 6+7 > >> > >> State is the state they live in now. Birthstate is the state they > >> were born in. For anyone born in state 2, I want "X" to be the sum of > >> Total for the other states they do not live in. For example, for > >> person born in state 2, now living in state 1, I want to sum the Total > >> for other people born in state 2 who live in state 1, state 3, and > >> state 4. > >> To create "Y", for example, for person born in state 2, living in > >> state 1, I want to sum Total for other persons born in the same state > >> who now live in state 3,and 4. I don't want to include for this > >> person's sum of Total, the combination of state 2 and born in state > >> 2. And the same for born in state 3, living in state 1, I want to > >> exclude born in state 3, living in 3, but include in the sum of the > >> Total born in state 3, living in state 2 and 4. For the sum of Total, > >> for the observation, born in state 3 living in state 3, I want to > >> include the sum of Total for anyone else living in another state that > >> is not state 3, so state 1, 2, and 4 would be included in the sum of > >> Total for this observation. > * * 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/

**Follow-Ups**:**RE: st: creating a new variable?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: creating a new variable?***From:*"Ms. Marilyn Ibarra" <ibarra@uga.edu>

**Re: st: creating a new variable?***From:*Jeph Herrin <junk@spandrel.net>

**Re: st: creating a new variable?***From:*Jeph Herrin <junk@spandrel.net>

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