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 <[email protected]> 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.
>
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