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RE: st: counting events


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: counting events
Date   Thu, 8 Feb 2007 00:00:53 -0000

I don't understand all this. You make various
statements that are not substantiated. Nor
can I comment on code you don't show us or 
reports that things did not work. 

Also, -egen, group()- doesn't work from the bottom
to the top. It assigns labels according to 
sort order of the variable lists. This is 
explained in the help. 

How to respect the current order of observations
was explained in my last email. 

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

Ana Gabriela Guerrero Serdan
 
> Yes, I included only the ones that died.  I have more
> than 50,000 observations, I didnt list them all here
> but I cannot use tab, so its also difficult to
> generate a variable and replace, I assume to have
> thousands of events. 
>  
> 
> I have tried already using the egen function. But
> since I have mix non-numericals and numbers for each
> type of incident it somehow doesnt count the number of
> events. 
> 
> 
>  But I will look into the ssc distinct events. 
> 
> Doing what you suggested gives me the following: 
> . egen event = group(incident)
> 
> . list count incident event
> 
>        +--------------------------+
>        | count   incident   event |
>        |--------------------------|
>     1. |     1       x007    5145 |
>     2. |     2       x038    5175 |
>     3. |     3       x038    5175 |
>     4. |     4       x038    5175 |
>     5. |     5       x038    5175 |
>        |--------------------------|
>     6. |     6       x038    5175 |
>     7. |     7       x038    5175 |
>     8. |     8       x038    5175 |
>     9. |     9       x038    5175 |
>    10. |    10       x038    5175 |
>        |--------------------------|
>    11. |    11       x038    5175 |
>    12. |    12       x038    5175 |
>    13. |    13       x038    5175 |
>    14. |    14       x038    5175 |
>    15. |    15       x038    5175 |
> 
> I does assign a different number to each event but it
> does it from the botton to top.  
 
 
> --- n j cox <n.j.cox@durham.ac.uk> wrote:
> 
> > I can't see details on died or not died here.
> > I guess everybody in the dataset died.
> > 
> > On one question, you want the number of distinct
> > incidents.
> > This is given by
> > 
> > tab incident
> > di r(r)
> > 
> > or by
> > 
> > ssc inst distinct
> > distinct incident
> > 
> > See also
> > How do I compute the number of distinct
> > observations?
> > http://www.stata.com/support/faqs/data/distinct.html
> > 
> > On another question, you want to label distinct
> > incidents, 1 up.
> > 
> > This is
> > 
> > egen event = group(incident)
> > 
> > See also
> > How do I create individual identifiers numbered from
> > 1 upwards?
> > http://www.stata.com/support/faqs/data/group.html
> > 
> > In short, the FAQs are friendly answers to your
> > questions.
> > 
> > (Incidentally, for me,
> > 
> > sort incident count
> > by incident : gen event = _n
> > 
> > does not do what you report.)
> > 
> > Nick
> > n.j.cox@durham.ac.uk
> > 
> > Ana Gabriela Guerrero Serdan
> > 
> > I am struggling on the following. I need to count
> > the
> > events or number of incidents where people died. I
> > have information at the individual level such as:
> > 
> >   +----------------------------+
> >         | count   incident       sex |
> >         |----------------------------|
> >      1. |     1       x007   unknown |
> >      2. |     2       x038      male |
> >      3. |     3       x038      male |
> >      4. |     4       x038      male |
> >      5. |     5       k000    female |
> >         |----------------------------|
> >      6. |     6       k000   unknown |
> >      7. |     7       x038   unknown |
> >      8. |     8       x038   unknown |
> >      9. |     9       x035   unknown |
> >     10. |    10       x040   unknown |
> > 
> > I am trying to generate a new variable call "event"
> > that will put a number to each same incident
> > 
> > like: incident x007 event 1
> >        incident x038 event 2
> >        incident k000 event 3
> > etc..
> > 
> > I tried using:
> > 
> > sort  incident count
> > by incident: gen event = _n
> > 
> > but it gives only values to 1 to the first event and
> > 0
> > to the rest.

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