[R] Counting

[Ashta]

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