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RE: st: Create the count of occurances in a panel


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Create the count of occurances in a panel
Date   Fri, 22 Apr 2005 16:56:47 +0100

Thanks for summarising the thread. Note, 
however, that Svend's solution also 
included exactly what you asked for
(see bottom line of his message). 

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

wying1@umbc.edu
 
> Thanks all for answering me this.  All provide me with very useful
> information.  For future reference,  I summarize each method.  Matt's
> method generates the total count of occurances for each ID, 
> but collapses
> the data.  Svend sets a record number for each ID.  Nick's method is a
> shortcut to what I am looking for.  Thanks again.
 
> > Yet another way is
> >
> > egen totobs = sum(1), by(id)
> >
> > (what is the observation number? 1 + 1 + 1 + ...)
> >
> > or -- for slightly more subtle reasons --
> >
> > egen totobs = count(1), by(id)
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > Svend Juul
> >
> >> bysort id: generate nobs=_n
> >> bysort id: generate totobs=_N

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