[R] counts for grouped data

[Spencer Graves]

Have you considered "table"?

spencer graves

Paul Green wrote:
> How does one get counts for grouped data
> from ungrouped data. For example, how can
> I get
> 
>         X1  X2  Count
>         1     1      1
>         1     2      2
>         2     1      1
>         2     2      1
> 
> from
> 
>         X1  X2
>         A    A
>         A    B
>         B    B
>         A    B
>         B    A
> 
> Thanks in advance
> 
> Paul Green
> 
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