Could some one should help me about this. data dt1; input a1 a2 a3; cards; 1  2    3 4  4   4 ; run;   output: a1  a2  a3  flag  count 1    2    3   yes     2 4    4   4    no      0   if the value is changed across observation then flag yes else no, if there is a change how many times its changed(count) ... View more