SAS Programmer Interview Questions and Answers

SAS macros are reusable code blocks that automate repetitive tasks and simplify complex code.

• Macros allow for parameterization and dynamic code generation

• They can be used to create custom functions and automate data cleaning and analysis

• Macros can improve code readability and reduce errors

• Example: %macro calc_mean(var); proc means data=mydata mean; var &var; run; %mend;

• Example usage: %calc_mean(age)

Assigning labels to variables in SAS involves using the LABEL statement in a DATA step.

• Use the LABEL statement in a DATA step to assign labels to variables.

• Specify the variable name followed by the label in quotes.

• Example: LABEL age='Age in years';

SAS and SQL Join are used to combine data from multiple tables based on a common key.

• Use PROC SQL in SAS to perform SQL Joins

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Specify the join condition using ON clause

• Example: SELECT * FROM table1 t1 INNER JOIN table2 t2 ON t1.key = t2.key;

Data validation involves checking for accuracy, completeness, consistency, and conformity to standards.

• Check for missing values

• Verify data types and formats

• Cross-validate data with external sources

• Identify outliers and anomalies

• Perform statistical tests for consistency