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# RE: st: Count observations

 From "Feiveson, Alan H. (JSC-SK311)" To "statalist@hsphsun2.harvard.edu" Subject RE: st: Count observations Date Thu, 27 Jun 2013 12:34:56 -0500

```Another simple way is

qui tab auto
di r(r)

Al Feiveson

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: Thursday, June 27, 2013 12:23 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Count observations

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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```

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