Re: st: Again-Unique Case ID in Large Panel

["Stephen V. Burks" <svburks@mrs.umn.edu>]

Hi, Suzy.

OK, if you are correct then both version of -duplicates- agree that I have no
duplicates. But, this means they both still disagree with -xtdes-, right?

My original starting point was that -xtdes- says I do not have unique 
identifcation,
but other approaches (now including both versions of -duplicates-) say that 
this
is incorrect, and I should (do) have unique identification.

Is there another misinterpretation on my part buried somewhere here?

Thanks,
Steve

P.S. just got Nick's post which seems to agree with me, once I accept Suzy's
interpretation on -duplicates-.

At 12:24 PM 8/4/2004, you wrote:

> I believe that your output is saying that you have one copy of  1322511 
> with no surpluses (no duplicates). I just ran this yesterday with my much 
> smaller dataset and was able to verify this.
> Suzy
>
> Stephen V. Burks wrote:
>
>
> > Hi, Folks.
> >
> > Now I wonder if I am reporting a bug.  As per Nick's suggestion
> > (thanks, Nick) I looked up -duplicates- and ran it.
> >
> > Results:
> > (1) using -duplicates report-
> >
> > . duplicates report  DRVNUM  CDATE
> >
> > Duplicates in terms of DRVNUM CDATE
> > --------------------------------------
> >    copies | observations       surplus
> > ----------+---------------------------
> >         1 |      1322511             0
> > --------------------------------------
> >
> > (2) using -duplicates list-
> >
> > . duplicates list  DRVNUM  CDATE
> > Duplicates in terms of DRVNUM CDATE
> > (0 observations are duplicates)
> >
> >
> > If I read this correctly, one version of -duplicates- says I have
> > a single duplicate (the last case in the file), while the other
> > says I have none. Also, -xtdes- still says that DRVNUM and
> > CDATE do not uniquely identify cases.
> >
> > I looked in the data browser, and the last case is NOT a duplicate.
> > While DRVNUM is the same as the case before, CDATE is not.
> >
> > If my interpretation of the output is correct then my best guess is
> > that -xtdes- is wrong to say I do not have unique identification,
> > and whatever bug causes this might also be behind the apparently
> > incorrect response from -duplicates report-.  In any event, it seems
> > to be a problem that -duplicates list- and -xtdes- do not agree.
> >
> > Any better ideas?
> >
> > Thanks,
> > Steve
> >
> > P.S. My version of Stata is 8.2 for WinXP, with current updates.
> >
> > --------------------------------------------------
> > *Stephen V. Burks, Ph.D.
> > *Assistant Professor of Economics and Management
> > *University of Minnesota, Morris
> > *
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--------------------------------------------------
*Stephen V. Burks, Ph.D.
*Assistant Professor of Economics and Management
*University of Minnesota, Morris
*
*Division of Social Sciences
*600 East 4th Street
*Morris, MN 56267-2134
*
*Voice: (320) 589-6191
*Division Staff: (320) 589-6200
*FAX: (320) 589-6117
*E-Mail:  svburks@mrs.umn.edu
*
* "Striving to be the Best National
*  Public Liberal Arts College in the U.S."
---------------------------------------------------  
*
*   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/