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Re: st: empty dataset; display gives impossible answer


From   "A.M. Vos" <a.vos@erasmusmc.nl>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: empty dataset; display gives impossible answer
Date   Wed, 30 Jun 2004 13:05:34 +0200

thanks, I'll take it for granted than.
Annelies

Roger Harbord wrote:

> This is reproducible using the auto dataset so it's not an artefact of your
> particular data:
>
> . sysuse auto
> (1978 Automobile Data)
>
> . list in 1
>
>      +---------------------------------------------------------------+
>   1. | make        | price | mpg | rep78 | headroom | trunk | weight |
>      | AMC Concord | 4,099 |  22 |     3 |      2.5 |    11 |  2,930 |
>      |---------------------+-------------+---------------------------|
>      |  length   |  turn   |  displa~t   |  gear_r~o   |   foreign   |
>      |     186   |    40   |       121   |      3.58   |  Domestic   |
>      +---------------------------------------------------------------+
>
> . keep if 1==2
> (74 observations deleted)
>
> . list
>
> . count
>     0
>
> . di make price mpg
> AMC Concord409922
>
> Roger.
> ----------------------------------------------------
> Roger Harbord     mailto:roger.harbord@bristol.ac.uk
> Department of Social Medicine, University of Bristol
>
> --On 30 June 2004 10:52 +0200 "A.M. Vos" <a.vos@erasmusmc.nl> wrote:
>
> > that was my first thought too, but it is not. Neither is UNIEKNR the 11th
> > variable.
> > and I would expect either two stata answers (because I asked display two
> > variables), or an error message, or just nothing.
> > It's just curiosity, it may not be important at all, but I would like to
> > understand it.
> > Annelies
> >
> > Toyoto Iwata wrote:
> >
> >> Sorry, perhaps this is my mistake.
> >>
> >> CL_NR was the eleventh variable. and Stata should be reporting
> >> its token.
> >>
> >> At 17:09 04/06/30 +0900, I wrote:
> >> > In case "CLPL =. "
> >> >
> >> > .list (varlist you need for the diagnosis)
> >> >
> >> >
> >> > Toyoto
> >> >
> >>
> >> > the "keep" I had an empty dataset, with only the names of all (about 50)
> >> > variables. Why than did "display <variable1> <variable2>" give an
> >> > answer, and what does it mean?
> >> >
> >> > . dis _N
> >> > 8200
> >> >
> >> > . keep if (FIRSTCAS==1 & CLPL~=1)
> >> > (8200 observations deleted)
> >> >
> >> > . dis CL_NR UNIEKNR
> >> > 11
> >> >
> >> > thanks for any thougts,
> >> > Annelies
> >> >
> >> >
> >> > --
> >> > A.M. Vos
> >> > dept. of Public Health
> >> > Erasmus MC
> >>
> >> *
> >> *   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/
> >
> > --
> > A.M. Vos
> > dept. of Public Health
> > Erasmus MC
> > University Medical Center Rotterdam
> > P.O. Box 1738
> > 3000 DR Rotterdam
> > The Netherlands
> > Tel: +31 (10) 4087502
> > Fax: +31 (10) 4089449
> > email: a.vos@erasmusmc.nl
> >
> >
> > *
> > *   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/

--
A.M. Vos
dept. of Public Health
Erasmus MC
University Medical Center Rotterdam
P.O. Box 1738
3000 DR Rotterdam
The Netherlands
Tel: +31 (10) 4087502
Fax: +31 (10) 4089449
email: a.vos@erasmusmc.nl


*
*   For searches and help try:
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*   http://www.ats.ucla.edu/stat/stata/



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