[R] Re : Frequency count

[Andrew Robinson]

Try table(), aggregate(), or tapply(), using length() in the last two
functions.

I hope that this helps,

Andrew

On Wed, Jan 05, 2005 at 11:36:07AM +1300, ssim at lic.co.nz wrote:
> Dear list,
> 
> I have a dataset as follow and I would like to count the frequencies for
> the combination of the two variables (f1 and f2)  for each id. I know it is
> should be straight forward, but I just don't know how to do it in R. Here
> is the SAS code I will use to get the output I want :
> 
> proc means nway;
> class id f1 f2;
> var flag
> output out=temp;
> 
> 
> Dataset:
> id    f1    f2    flag
> 798   1     2     1
> 777   0     2     1
> 798   2     2     1
> 777   0     2     1
> 777   1     1     1
> 
> Output:
> Id=798
> 1-2   1
> 2-2   1
> 
> Id=777
> 0-2   2
> 1-1   1
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