Quick Answer: What Is A SAS Data Step?

Do until in SAS macro?

The %DO %UNTIL statement checks the value of the condition at the bottom of each iteration; thus, a %DO %UNTIL loop always iterates at least once..

Do loop SAS data step?

Iterative DO loops are the simplest form of DO loops that can be executed within a SAS Data Step. The actions of an iterative DO loop are unconditional, meaning that if you define a loop to execute 50 times, it will execute 50 times without stopping (unless an error occurs during processing).

How do I filter in SAS?

To create a filter by using the Filter and Sort window:After you have selected the variables that you want to include in the output table, click the Filter tab.Select a variable from the first drop-down list. … Select an operator from the second drop-down list.Enter a value in the third box or click.More items…•

How does retain work in SAS?

In the most general terms, the RETAIN statement is used to keep (retain) values from one observation to the next during iterations of the SAS Data Step. … The RETAIN statement overrides this default behaviour, and retains the value from the previous observation before completing the next iteration of the Data Step.

What does set mean in SAS?

SET reads an observation from an existing SAS data set. INPUT reads raw data from an external file or from in-stream data lines in order to create SAS variables and observations. Using the KEY= option with SET enables you to access observations nonsequentially in a SAS data set according to a value.

Does SAS Do Until statement?

The DO UNTIL statement executes statements in a DO loop repetitively until a condition is true, checking the condition after each iteration of the DO loop. The DO WHILE statement evaluates the condition at the top of the loop; the DO UNTIL statement evaluates the condition at the bottom of the loop.

Do loops SAS macro?

In the DATA step, you can use the DO-END construct to loop through data. In the SAS Macro Language, you can use the %DO-%END construct to build SAS code. Index is a valid macro variable name. The names “I” for ‘index’ or “N” for ‘number’ are frequently used as the Index name.

How do I drop observations in SAS?

To remove observations in SAS, you can use the IF statement in a DATA step. Suppose you want to exclude all observations whose scores are greater than 100.

How do you use the operator in SAS?

In order to use the IN operator, two SAS options need to be considered:MINOPERATOR: This is the most important of the two options as, when set, this allows the IN operator to be used.MINDELIMITER=: Defines a single character to be used as a delimiter for the list of values used in the IN operator.

What are the two general types of SAS steps?

Proc Step. SAS programs are comprised of two distinct steps: data steps and proc steps. Data steps are written by you, while procedures are pre-written programs that are built-in. In general, Data steps are used to read, modify and create data files and always begin with a “DATA” statement.

Where in SAS is data step?

The WHERE statement can only be used in DATA steps that use existing SAS data set(s) as input, i.e., a SET, MERGE, or UPDATE statement must exist. If you are using an INPUT statement to read in “raw” files, then you cannot use WHERE.

What is the difference between data step and PROC step in SAS?

Data step (begin with “DATA” statement) is to read or modify data , and creates a SAS data set. Proc step (begin with “PROC” statement) is to perform specific analysis , and produce results. … How big can be big data?

How do you keep variables in SAS?

The KEEP= option tells SAS which variables you want to keep in a data set. If you place the KEEP= option on the SET statement, SAS keeps the specified variables when it reads the input data set.

Where is also SAS?

You can use an ALSO operator in a WHERE statement (or function). Use a series of WHERE statements instead of a single statement. The condition clauses are combined as if you wrote a single WHERE statement with the condition clauses ANDed together.

How do you read a SAS code?

SAS Programming: SAS Code StructureAlmost every code will begin with either DATA or a PROC Step.Every line of SAS code ends with a semi colon.A SAS code ends with RUN or QUIT keyword.SAS codes are not case sensitive.You can write a code across different lines or you can write multiple statements in one line.

How do I write SAS code?

SAS programs include two types of steps: DATA steps and PROC steps. DATA steps begin with the keyword DATA, and PROC steps begin with the keyword PROC. Generally, a step ends with a RUN statement or when a new DATA or PROC step begins. A RUN statement tells SAS to process all of the preceding lines of the step.

What is SAS output?

The OUTPUT statement tells SAS to write the current observation to a SAS data set immediately, not at the end of the DATA step. If no data set name is specified in the OUTPUT statement, the observation is written to the data set or data sets that are listed in the DATA statement.

How do you subset in SAS?

Subsetting a SAS data set means extracting a part of the data set by selecting a fewer number of variables or fewer number of observations or both. While subsetting of variables is done by using KEEP and DROP statement, the sub setting of observations is done using DELETE statement.

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 are SAS components?

The SAS software suite has more than 200 components Some of the SAS components include:Base SAS – Basic procedures and data management.SAS/STAT – Statistical analysis.SAS/GRAPH – Graphics and presentation.SAS/OR – Operations research.SAS/ETS – Econometrics and Time Series Analysis.SAS/IML – Interactive matrix language.More items…

Is Data step faster than PROC SQL?

The DATA step can handle processing large data calculations faster but the SQL procedure has the SQL optimizer that looks at the results you want and then determines the best way to execute.