adding new data to existing variable

[Qvika]

Hi, 

I am trying to add new observations in my data set in an existing variable, but it does not seem to work. 

I have a variable called ID (identification number) and a variable called periodID (1-5), so I can add different periods per ID. Some ID's only have 1 periodID line where I would like to have 2 or 3, but I can't seem to add more lines (called periodID 2 and periodID 3). I am working from a pre-existing work.query. So I tried to make a new data set:

DATA newperiod;

SET oldperiod;

IF ID=200 THEN periodID=1, 2, 3;

RUN;

This gives me an error. Does somebody know how to fix this problem?

[SASJedi · Accepted solution]

It looks to me like you want to create a new table named newperiod which contains all of the original rows of data from oldperiod, but includes additional rows for ID 200. If that's the goal, you'll need to use a conditional DO loop with a explicit OUTPUT statements to control when rows get written to newperiod. Something like this should do the tirck:

/* Create some test data to play with */
data oldperiod;
   infile datalines truncover;
   input ID PeriodID;
datalines;
100 1
100 2
200 
300 1
300 2
300 3
400 1
400 2
500 1
;

/* Add extra rows for ID # 200 */
data newperiod;
   set oldperiod;
   if ID=200 then do periodID=1, 2, 3;
      output;
   end;
   else output;
run;

May the SAS be with you 🙂
Mark

[Qvika]

Thank you so much Mark! that helped a lot.

But now when I try to add additional data my IF-THEN statement refuses to work. This is my code: 

DATA newperiod;

IF ID=200 then do periodID=1, 2, 3;
output;
end;
else IF ID=200 AND periodID=1 then do;

kidperiodstart=150;

kidperiodend=350;

end;
else output;

RUN;

The AND statement is not highlighted, how do I get this to work?