How to create a new variable in sas

How do I create a new variable in SAS?

Ways to Create Variables
  1. Overview.
  2. Create a New Variable Using the LENGTH Statement.
  3. Create a New Variable Using the ATTRIB Statement.
  4. Create a New Variable Using an Assignment Statement.
  5. Reading Data with the INPUT Statement in a DATA Step.
  6. Create a New Variable Using the FORMAT or INFORMAT Statements.
  7. Using the IN= Data Set Option.

How do you add data in SAS?

Begin the DATA step and create a SAS data set called WEIGHT. Specify the external file that contains your data. Read a record and assign values to three variables. Calculate a value for variable WeightLoss.

How do you create a dummy variable in SAS?

To generate the dummy variables, put the names of the categorical variables on the CLASS and MODEL statements. You can use the OUTDESIGN= option to write the dummy variables (and, optionally, the original variables) to a SAS data set.

What are SAS variables?

A SAS dataset consists of columns of variables and rows of observations. Variables correspond to characteristics of the data that are documented for all (or most) of the observations.

How do you use length in SAS?

A well known function in SAS is the LENGTH function – used to return the length of a character string. The function will return an integer which represents the position of the last (on the right) character in the string. Trailing blanks will be ignored.

How do you make a variable numeric in SAS?

To convert character values to numeric values, use the INPUT function. new_variable = input(original_variable, informat.); The informat tells SAS how to interpret the data in the original character variable.

How do I rename a variable in SAS?

You rename a SAS variable with the RENAME option. The RENAME option is a data set option which enables you to change the name of a variable. First of all, you define the old variable name, then an equal sign, and finally the new variable name. You can rename one or more variables with one RENAME option.

What is DATE9 format in SAS?

A SAS format is aan instruction that converts the internal numerical value of a SAS variable to a character string that can be printed or displayed. format (for the DATE variable), the DATE9. format (for the DATE1 variable), and no format (for the DATE0 variable).

How do I change a variable in SAS?

You cannot change the type of a variable. You will need to create a new variable from the old variable with the new data type and then drop and rename to keep the original names.

How do I convert a character to date in SAS?

To convert a numerical variable into a SAS Date variable, you must first convert the NUM into a CHAR, and then convert the CHAR into a DATE. The PUT function converts any type of variable into a CHAR variable.

What is put statement in SAS?

Writes lines to the SAS log, to the SAS output window, or to an external location that is specified in the most recent FILE statement.

What is put function in SAS?

The PUT function returns a value using a specified format. You must use an assignment statement to store the value in a variable. The PUT statement writes a value to an external destination (either the SAS log or a destination, that you specify).

What does <> mean in SAS?

As part of support for SQL syntax SAS had to adjust to allow <> to mean not equal in SQL code. So in PROC SQL code and WHERE statements <> means not equal. But in data step code it still means MAX. So if you use <> in an IF statement then you are requesting the MAX operator instead of the NOT EQUALS operator.

What does dollar sign mean in SAS?

A dollar sign ($) on an INPUT statement in SAS means that: the unit of measurement is dollars. the delimiter separating that variable from the next variable is changed from one blank space to two blank spaces. the variable has some missing values. the variable may have character values.

What is %put SAS?

is text or a text expression that is written to the SAS log. If text is longer than the current line size, the remainder of the text appears on the next line. The %PUT statement removes leading and trailing blanks from text unless you use a macro quoting function.

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.

What is BEST12 format in SAS?

refers to the instructions that SAS uses when printing variable values. If no format is specified, the default format is BEST12. refers to the instructions that SAS uses when reading data values. If no informat is specified, the default informat is w.d for a numeric variable, and $w. for a character variable.

How do I use attrib in SAS?

Using the ATTRIB statement in the DATA step permanently associates attributes with variables by changing the descriptor information of the SAS data set that contains the variables. You can use ATTRIB in a PROC step, but the rules are different.

What is _numeric_ in SAS?

You use the two keywords _NUMERIC_ and _CHARACTER_ in the ARRAY statements to start the ball rolling. When these keywords are used in a DATA step, they refer to all of the numeric or character variables at that point in the DATA step.

What is the difference between informat and format in SAS?

Informats tell SAS how to read data, while formats tell SAS how to write (or print) data.

How do you write dates in SAS?

SAS date values are written in a SAS program by placing the dates in single quotes followed by a D. The date is represented by the day of the month, the three letter abbreviation of the month name, and the year. For example, SAS reads the value ’17OCT1991’D the same as 11612, the SAS date value for 17 October 1991.

What does 8 mean in SAS?

It means to read the first 8 characters as a number. If there is a decimal point in the data then it is used naturally. You could have up to 7 digits to the right of the decimal point (since the decimal point would use up the eighth character position).

How do I convert a number to a date in SAS?

To change a numeric variable to a SAS date value, use both the PUT and INPUT functions. The PUT function converts the value from numeric to character. The INPUT function will then convert the character variable to the numeric SAS date.