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
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.