[R] Counting

[Peter Ehlers]

How about

  unch <- aggregate(x2==x1, by = list(x1=x1), FUN = sum)
  chgd <- aggregate(x2!=x1, by = list(x1=x1), FUN = sum)

  -Peter Ehlers

Ashta wrote:
> Hi All,
> 
> Assume that I have the following data set  with two variables and I
> want count the number of observation with identical values  and number
> of time each factor changed from x1 to x2.
> 
> x1  x2
>  1    1
>  1    0
>  0    1
>  0    1
>  0    0
>  1    1
>  0    1
> 
> The output should be
> x1  changed
>                       0   3    # has changed 3 times
>                       1   1    # has changed 1 time
> x1 unchanged
>                       0  1    # has unchanged only 1 time
>                       1  2     # has unchanged 2 times
> 
> Can someone help me how to do it in R?
> 
> Thanks in advance
> 
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