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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: Count observations |
| Date | Thu, 27 Jun 2013 18:23:19 +0100 |
There was a review of this area in
http://www.stata-journal.com/sjpdf.html?articlenum=dm0042
The article discusses several ways to approach the question, including
the program -distinct-, which you could download from the Stata
Journal site. (-search distinct- first.)
. sysuse auto
(1978 Automobile Data)
. distinct
| Observations
| total distinct
--------------+----------------------
make | 74 74
price | 74 74
mpg | 74 21
rep78 | 69 5
headroom | 74 8
trunk | 74 18
weight | 74 64
length | 74 47
turn | 74 18
displacement | 74 31
gear_ratio | 74 36
foreign | 74 2
Nick
njcoxstata@gmail.com
On 27 June 2013 18:13, Miguel Angel Duran Munoz <maduran@uma.es> wrote:
> Hi, Statalisters. I have a doubt that must have a very simple solution,
> but I have not been able to find it. I have a variable where some numbers
> appear more than once. And I would like to know the number of different
> numbers; ie, variable = 1 1 1 2 3 4 4 4..., so there are 4 different
> numbers.
>
> Thanks in advance.
>
> Miguel.
>
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