Question: What Are Variables In SAS?

What are the data types in SAS?

SAS has only two data types: real numbers and fixed length character strings.

Dates and times are internally stored as numbers.

Macro variables are always characters..

How do you add a new variable in SAS?

Ways to Create VariablesOverview.Create a New Variable Using the LENGTH Statement.Create a New Variable Using the ATTRIB Statement.Create a New Variable Using an Assignment Statement.Reading Data with the INPUT Statement in a DATA Step. … Create a New Variable Using the FORMAT or INFORMAT Statements.Using the IN= Data Set Option.

How do you truncate in SAS?

The TRUNC function comes to mind….We can do it in 3 steps:Multiply our number by 104, effectively making the decimals part of a whole number (shifting the decimal point 4 positions to the right).Apply INT() function that truncates the decimal portion, keeping only the whole portion from the previous step.More items…•

How do you define a variable in SAS?

You can create variables in a DATA step in the following ways:by using an assignment statement.by reading data with the INPUT statement in a DATA step.by specifying a new variable in a FORMAT or INFORMAT statement.by specifying a new variable in a LENGTH statement.by specifying a new variable in an ATTRIB statement.

How do I change 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. birthdate_char = PUT(birthdate_num, 6.0); birthdate = INPUT(birthdate_char, yymmdd6.);

How do you control decimal places in SAS?

To limit decimal places, use the MAXDEC= option in the PROC MEANS statement, and set it equal to the … Get SAS Certification Prep Guide: Base Programming for SAS 9, Third Edition now with O’Reilly online learning.

How can I get column names and datatypes of a table in Teradata?

You can use “SHOW VIEW VIEW_NAME” or “HELP COLUMN VIEW_NAME. *” to get all column names and datatype in the view.

How do you change a variable in SAS?

SAS uses the BESTw. format, where w is the width of the character variable and has a maximum value of 32. 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.

What is proc means in SAS?

ABSTRACT. PROC MEANS is a basic procedure within BASE SAS® used primarily for answering questions about quantities (How much?, What is the average?, What is the total?, etc.)

How do I convert numeric to SAS?

Convert character to numeric. 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 does SAS define Libname?

The general syntax for a LIBNAME statement is LIBNAME nickname ‘name-of-directory’; where nickname = a valid SAS beginning with either a letter or an underscore and having no more than 8 characters. name-of-directory = the path and name of the directory enclosed in quotes.

What is a macro SAS?

Macros are simply a group of SAS statements that have a name. … %MACRO macro-name; macro-text %MEND macro-name; SUGI 29 Tutorials Page 4 4 The %MACRO statement tells SAS that this is the beginning of the macro and the %MEND statement signals the end of the macro. Macro-name is a name you make up for your macro.

What does %let mean in SAS?

Leading and trailing blanks in value are ignored; to make them significant, enclose value with the %STR function. Details. If the macro variable named in the %LET statement already exists, the %LET statement changes the value. A %LET statement can define only one macro variable at a time. Example.

What is Proc Freq?

Proc FREQ is a procedure that is used to give descriptive statistics about a particular data set. Proc FREQ is used to create frequency and cross-tabulation tables. It enables analysis at various levels. Associations between variables and responses can be tested and computed.

What is SAS Libname?

One or many datasets can be assigned to the same library. A library is assigned a location with a LIBNAME statement in SAS. A LIBNAME statement is one of those global statements that we mentioned in Section 1 that does not occur in a data step or a proc step.

How do you round a variable in SAS?

ROUND is the function name; argument is the numeric value or variable you want to have rounded; and rounding-unit is the unit that you want to result to be rounded to (e.g. 10, 100, 0.1, 0.01, 5, etc.) For example, ROUND(34.58, 0.1) tells SAS to round the number 34.58 to the nearest tenth. SAS will return 34.6.