topic Re: Variable uninitialized in SAS Studio

Variable uninitialized

nikky — Wed, 18 Sep 2019 13:58:13 GMT

I am trying to create a new variable LetterGrade with recoding GPA into alphabets.

However, I keep recieving the message saying variable uninitialized. Below is my code in SAS Studio

Please Help!

*Creating new variable based on Letter grade;
data Lgrades;
set students_additional;
  if 0<gpa<0.5 then LetterGrade=F;
  else if 0.5<gpa<1.5 then LetterGrade=D;
  else if 1.5<gpa<2.5 then LetterGrade=C;
  else if 2.5<gpa<3.5 then LetterGrade=B;
 else if gpa >=3.5 then LetterGrade=A;
 RUN;
 proc print data=Lgrades;
title 'LetterGrade Dataset';
run;
proc contents data=Lgrades;
run;

Re: Variable uninitialized

novinosrin — Wed, 18 Sep 2019 14:01:28 GMT

Hi @nikky

You would need to make recoded values a constant operand within "quotes" rather than variable operand.

For eg

if 0<gpa<0.5 then LetterGrade="F";

Re: Variable uninitialized

Tom — Wed, 18 Sep 2019 14:01:30 GMT

@nikky wrote:

I am trying to create a new variable LetterGrade with recoding GPA into alphabets.

However, I keep recieving the message saying variable uninitialized. Below is my code in SAS Studio

Please Help!
*Creating new variable based on Letter grade;
data Lgrades;
set students_additional;
  if 0<gpa<0.5 then LetterGrade=F;
  else if 0.5<gpa<1.5 then LetterGrade=D;
  else if 1.5<gpa<2.5 then LetterGrade=C;
  else if 2.5<gpa<3.5 then LetterGrade=B;
 else if gpa >=3.5 then LetterGrade=A;
 RUN;
 proc print data=Lgrades;
title 'LetterGrade Dataset';
run;
proc contents data=Lgrades;
run;

What values do the variables A, B, C and D have?

Or did you mean to set the variable to the character stings 'A', 'B', etc instead?

Re: Variable uninitialized

nikky — Wed, 18 Sep 2019 14:03:39 GMT

Thank you , I will do right away.

Re: Variable uninitialized

nikky — Wed, 18 Sep 2019 14:04:44 GMT

Yes Tom, I do mean to have them in character form.

Thank you

Re: Variable uninitialized

ballardw — Wed, 18 Sep 2019 15:18:59 GMT

@nikky wrote:

I am trying to create a new variable LetterGrade with recoding GPA into alphabets.

However, I keep recieving the message saying variable uninitialized. Below is my code in SAS Studio

Please Help!
*Creating new variable based on Letter grade;
data Lgrades;
set students_additional;
  if 0<gpa<0.5 then LetterGrade=F;
  else if 0.5<gpa<1.5 then LetterGrade=D;
  else if 1.5<gpa<2.5 then LetterGrade=C;
  else if 2.5<gpa<3.5 then LetterGrade=B;
 else if gpa >=3.5 then LetterGrade=A;
 RUN;
 proc print data=Lgrades;
title 'LetterGrade Dataset';
run;
proc contents data=Lgrades;
run;

So what grade do you want to assign with the GPA is exactly 0, 0.5, 1.5 or 2.5 ? You are excluding the end point in every single one of your comparisons with those values. I suspect that you may want

data Lgrades;
set students_additional;
  if 0<gpa<=0.5 then LetterGrade='F';
  else if 0.5<gpa<=1.5 then LetterGrade='D';
  else if 1.5<gpa<=2.5 then LetterGrade='C';
  else if 2.5<gpa<3.5 then LetterGrade='B';
 else if gpa >=3.5 then LetterGrade='A';
 RUN;

or similar