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RE: st: RE: how to use lag function to create sequential number


From   Sylvain Friederich <ecsjf@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: RE: how to use lag function to create sequential number
Date   Sun, 11 Sep 2005 20:36:01 +0100 (BST)

Ahem. This has the solutions Nick gave previously. Do
try either of them, paying attention to the command
syntax (bysort var: etc). 

Sylvain

--- mzhang@nd.edu wrote:

> if I use the command egen id = seq(), the id will be
> a sequential number from 1
> to 29 without telling the internal group difference.
> What I tried to do to get a
> sequential variable like 1 2 ..........17 1.......5
> 1 2 3.....7 instead of 1 2
> 3..............29.
> 
> Quoting Nick Cox <n.j.cox@durham.ac.uk>:
> 
> > This has the solution I gave previously. Do try
> it.
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > mzhang@nd.edu
> >
> > > Sorry I did not state my question well. there
> are different
> > > racial groups in my
> > > sample. What i want to do is to give each racial
> group a
> > > sequential number.
> > > for example, I have 17 whites, 5 blacks and 7
> others. then
> > > the value of the
> > > sequential variable I created would be: 1 2
> 3....17 for
> > > whites; 1 2 ...5 for
> > > blacks;
> > > 1 2 ....7 for others. what I was originally
> thinking is:
> > >
> > > gen sequence=1
> > > replace sequcence=sequence+1 if l.race==race
> > >
> > > However, this does not work out as I thought.
> >
> > Nick Cox
> >
> > > > I am not aware of a lag function, i.e.
> -lag()-, in Stata. There is
> > > > a lag operator L. but that is not appropriate
> for your purpose.
> > > >
> > > > You may be in search of
> > > >
> > > > bysort race : gen id = _n
> > > >
> > > > or
> > > >
> > > > bysort race : egen id = seq()
> > > >
> > > > although note that the labelling produced is
> essentially arbitrary
> > > > in either case.
> >
> > mzhang@nd.edu
> >
> > > > > for example, there are 17 people who have
> the same ethnicity.
> > > > > If I want to give
> > > > > them a sequential number 1 2 3..........17,
> how can I use lag
> > > > > function to do this?
> >
> > *
> > *   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/
> >
> 
> 
> 
> 
> 
> *
> *   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/
> 



		
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