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How to Create or Modify a Variable in SAS Programming?

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This will help you to create or modify a variable. It is common to define a new variable based on the existing variable. Let’s create a dataset In the code below, we are creating a dataset named as Example1 which is going to store on WORK(temporary) library. In this dataset, there would be a variable called OldRate which contains a numeric value. The RUN statement is defined to close the dataset program.
DATA Example1;
OldRate=42;
RUN;

                    
Output:
  1. Creating a numeric variable You can create variables using the form: variable = expression; Suppose you are asked to create a new variable NewRate, in the existing SAS data set Example1. Both variables are numeric. The variable NewRate is twice of OldRate.
    DATA Example1;
    SET Example1;
    NewRate=3*OldRate;
    RUN;
    
                        
    Output: If you are asked to store a new variable NewRate on a new dataset, you can create it using DATA statement.
    DATA Readin;
    SET Example1;
    NewRate=3*OldRate;
    RUN;
    
                        
    In above case, the dataset READIN was created.
  2. Creating a character variable In the dataset Example1, let’s create a character variable as Type. The character value for the set is set ‘GeeksforGeeks’. The quote marks need to be entered around the character variable.
    DATA Example1;
    SET Example1;
    Type = 'GeeksforGeeks';
    RUN;
    
                        
    Output: Since Type is a character variable, so the value entered should in quotes. It can be either single or double quotes.
  3. Creating or Modifying a variable Suppose the value of OldRate is increased by 8 units and you need to calculate the relative change in rate. In this case, we are modifying the existing variable OldRate so we will add 8 to OldRate. later we calculate the percentage change between old and new rate.
    DATA Readin;
    SET Example1;
    OldRate=8 + OldRate;
    NewRate=OldRate*3;
    Change= ((NewRate-OldRate)/ OldRate);
    Format Change Percent10.0;
    RUN;
    
                        
    Output: The FORMAT statement is used to display the changed value in percentage format.


  4. Last Updated : 23 Jul, 2019
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