How do you add a variable to an existing dataset in SAS?

How do you add a variable to an existing dataset in SAS?

The basic method of adding information to a SAS data set is to create a new variable in a DATA step with an assignment statement. An assignment statement has the form: variable=expression; The variable receives the new information; the expression creates the new information.

How do you create a variable in a dataset?

You can use the set command in a data statement to copy an existing dataset and create new variables. The variables can be completely new in which you assign values to them or can be based off existing variables in your dataset and you can manipulate them using mathematical functions.

How do you change a variable value in SAS?

The way to change the value of a variable in SAS is to use an assignment statement. The way to test if a variable has a specific value is to test for equality with = . To conditionally execute a statement use the IF/THEN structure. To test if a variable is any of a list of values use the IN operator instead.

What is data _null_ in SAS?

In SAS, the reserved keyword _NULL_ specifies a SAS data set that has no observations and no variables. The _NULL_ data set is often used when you want to execute DATA step code that displays a result, defines a macro variable, writes a text file, or makes calls to the EXECUTE subroutine.

How do you update a column in SAS?

Modifying a Column You can use the MODIFY clause to change the width, informat, format, and label of a column. To change a column’s name, use the RENAME= data set option. You cannot change a column’s data type by using the MODIFY clause.

How do I create new variable in SAS?

In a DATA step, you can create a new variable and assign it a value by using it for the first time on the left side of an assignment statement. SAS determines the length of a variable from its first occurrence in the DATA step. The new variable gets the same type and length as the expression on the right side of the assignment statement.

How to create variable in SAS?

I. Creating a numeric variable

Example1. Both variables are numeric. The variable NewPrice is twice of OldPrice.

II. Creating a character variable. In the same dataset Example1,let’s create a character variable say Type. The character value for set is set ‘Good’.

What is SAS arrays?

Arrays in SAS are used to store and retrieve a series of values using an index value. The index represents the location in a reserved memory area. Syntax. ARRAY is the SAS keyword to declare an array. ARRAY-NAME is the name of the array which follows the same rule as variable names.