Problem making new variable of correct answers

[Diana__]

Hello,

I was trying to run this code:

Data HW4set;
set mylib.HW4;
if 1 = p1p then correct = correct+1;
If 1 = p2p then correct = correct+1;
run;

But when I run it I get a variable of missing values.

How do you make a variable dependent on whether the value is 1 or 2(true/false)?

[Diana__]

*Whether the value is correct/incorrect.

*the p1p and p2p variables are at the beginning of the document, the correct variable is the 32nd variable.

[PaigeMiller · Accepted solution]

Your variable named CORRECT is not given a starting value, in other words, it is missing. So when you add 1 to missing, you get missing. You could re-write the code like this to eliminate the problem.

Data HW4set;
set mylib.HW4;
if 1 = p1p then correct = sum(correct,1);
If 1 = p2p then correct =sum(correct,1);
run;

OR

Data HW4set;
set mylib.HW4;
correct=0;
if 1 = p1p then correct = correct+1;
If 1 = p2p then correct = correct+1;
run;

[Diana__]

Thank you so much for your help!