Hello
I would like to mark value changes in a column like below:
ID | VALUE | CHANGE |
1 | 10 | 0 |
1 | 10 | 0 |
1 | 12 | 1 |
1 | 12 | 0 |
1 | 15 | 1 |
In this example ID and VALUE is my data and I want to make CHANGE column equal 1 each time the value change in given ID
I've tried this code but it aplies 0 each row. Maybe lag function could be helpful but I'm not sure how to use it
data want;
set have;
by id value notsorted;
count=first.value;
if first.id then count=0;
run;
Can you help me with solution?
ID VALUE change 1 10 0 1 10 0 1 12 1 1 12 0 1 15 1
Works for me:
data have;
input ID VALUE;
datalines;
1 10
1 10
1 12
1 12
1 15
;
data want;
set have;
by id value notsorted;
change = first.value;
if first.id then change = 0;
run;
proc print data=want noobs;
run;
Result:
ID VALUE change 1 10 0 1 10 0 1 12 1 1 12 0 1 15 1
ID VALUE change 1 10 0 1 10 0 1 12 1 1 12 0 1 15 1
Works for me:
data have;
input ID VALUE;
datalines;
1 10
1 10
1 12
1 12
1 15
;
data want;
set have;
by id value notsorted;
change = first.value;
if first.id then change = 0;
run;
proc print data=want noobs;
run;
Result:
ID VALUE change 1 10 0 1 10 0 1 12 1 1 12 0 1 15 1
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