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# RE: st: creating a new variable?

 From "Nick Cox" To Subject RE: st: creating a new variable? Date Sun, 19 Aug 2007 17:13:06 +0100

```This FAQ was also cited in a thread started earlier by

<http://www.hsph.harvard.edu/cgi-bin/lwgate/STATALIST/archives/statalist.0708/date/article-541.html>

Hence postings in that thread might be of interest
to people interested in this one.

Nick
n.j.cox@durham.ac.uk

Austin Nichols

> There is a relevant FAQ:
> http://www.stata.com/support/faqs/data/members.html

Marilyn Ibarra

> > >> 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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