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Re: st: new command -checkfor2-


From   "Tamazian, Artur" <oartur@usc.es>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: new command -checkfor2-
Date   Mon, 19 Sep 2005 20:13:49 +0200

 Thanks Kit.

Mensaje citado por Kit Baum <baum@bc.edu>:

> Amadou said
>
> Nick, from my point of view, it is easier to type:
> nmissing x
> than:
> count if x == .
>
> Easier, and nmissing (appropriately updated) gives the right answer,
> which count does not...
>
> Note that the count statement as given does not tell you how many
> missing values there are; it tells you how many are equal to ".".
> There are 27 kinds of missing values in Stata, and if you want to
> trap all of them,
>
> count if !(x<.)
>
> is needed:
>
> . tab rep78,missing
>
>       Repair |
> Record 1978 |      Freq.     Percent        Cum.
> ------------+-----------------------------------
>            1 |          2        2.70        2.70
>            2 |          8       10.81       13.51
>            3 |         29       39.19       52.70
>            4 |         18       24.32       77.03
>            5 |         11       14.86       91.89
>            . |          4        5.41       97.30
>           .a |          1        1.35       98.65
>           .b |          1        1.35      100.00
> ------------+-----------------------------------
>        Total |         74      100.00
>
> . count if rep78 == .
>      4
>
> . count if !(rep78<.)
>      6
>
>
> Kit Baum, Boston College Economics
> http://ideas.repec.org/e/pba1.html
>
>
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