[R] how to select cases based on value of one or more variables

[Simone Gabbriellini]

sorry for my bad presentation...

read.spss gives me this:

 > students
$Auno
   [1]  6  1  2  2  1  3  4  2  4  2  4  4  1  1 NA  1  4  2  1  1  1   
5  4
  [24]  2  1  2  1  2  1  4  4  1  1  1  2  1  6  1  1  1  1  1  2  1   
2  1
  [47]  2  2  1  4  2  4  3  1  1  1  1  3  2  1  4  4  4  4  2  4  1   
2  4
  [70]  1  3  4  5  2  4  3  5  5  4  2  1  1  1  1  4  5  2  4  4  1   
4  2
  [93]  1  2  3  3  2  1  2  2  2  1  1  1  3  5  5  5  2 NA  2  1 NA   
5  2
[116]  1  4  2 NA  1  4  5  2  3  1  1  1  1  4  2  1  1  3  2  4  2   
4  2
[139]  1  4  1  2  4  1  2  3  2  1  1  2  4  4  3  4  1  1  3  2  1   
1  2
[162]  1  2  5  5  5  1  4  3  2  3  3  2  1  1  5  1  2  1  1  2  1   
2  1
[185]  1  2  1  1  1  1  3  4  2  1  4  2  4  1  4  2  1  1  1  2  1   
4  1
[208]  5  1  1  4  4  2  1  1  5  4  1  1  5  5  4  1  4

$Sex
   [1] 2 1 2 1 2 2 2 2 1 2 1 1 2 1 0 2 2 2 2 2 2 2 2 1 2 2 1 2 2 1 2 2  
2 1
  [35] 2 2 2 1 1 2 2 2 2 2 2 2 2 2 1 1 1 1 2 2 2 2 2 2 2 1 1 2 2 2 2 2  
1 2
  [69] 2 1 2 1 2 1 2 2 2 2 2 2 1 2 2 2 1 2 2 2 1 1 1 2 1 2 1 2 2 2 2 2  
2 2
[103] 2 2 2 2 1 2 2 2 2 2 2 2 2 2 1 2 0 2 2 2 1 2 2 1 2 1 2 2 1 1 2 1  
2 1
[137] 2 1 2 1 1 1 1 1 1 2 1 1 2 2 2 2 1 1 2 2 2 2 2 2 2 2 2 2 2 2 1 1  
2 2
[171] 2 2 2 2 2 1 1 1 1 2 2 2 2 2 2 2 2 1 2 2 1 1 1 1 1 2 0 2 2 1 2 1  
2 2
[205] 1 2 2 2 2 2 2 2 2 2 1 2 2 1 1 2 2 2 2 2

....

I would like to filter - or subset - the dataset for $Sex = 1 (in this  
case means male...),  for example...

thanks anyway,
Simone



Il giorno 30/nov/08, alle ore 21:49, Don MacQueen ha scritto:

> It is.
>
> For example, if you have a variable stored as a vector named "x",  
> and another variable stored as aa vector named "y", you can select  
> cases of y where x is greater than 3 by using
>
>  y[x>3]
>
> However, you're going to have to provide more information in order  
> to get a better answer than that (see the posting guide, link  
> included with every post to r-help). In particular, I'm guessing  
> that the answer you really want looks somewhat different than my  
> example -- but this depends on the exact structure of what  
> read.spss() produces.
>
> I'd also suggest reading some of the documentation available from  
> the R website (CRAN), notably, "An Introduction to R".
>
> -Don
>
> At 9:36 PM +0100 11/30/08, Simone Gabbriellini wrote:
>> dear list,
>>
>> I have read a spss file with read.spss()
>>
>> now I have a list with all my variable stored as vectors.
>>
>> is it possible to selec cases based on the value of one or more  
>> variables?
>>
>> thank you,
>> Simone
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https:// stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http:// www. R-project.org/posting- 
>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
> -- 
> ---------------------------------
> Don MacQueen
> Lawrence Livermore National Laboratory
> Livermore, CA, USA
> 925-423-1062
> macq at llnl.gov
> ---------------------------------