SAS Certification Prep Guide, 4th Edition

Modifying All Observations in a SAS Data Set

Overview

When every observation in a SAS data set requires the same modification, you can use the MODIFY statement and specify the modification using an assignment statement.

General form, MODIFY statement with an assignment statement: DATA SAS-data-set; MODIFY SAS-data-set; existing-variable = expression; RUN; Here is an explanation of the syntax: SAS-data-set is the name of the SAS data set that you want to modify. existing-variable is the name of the variable whose values you want to update. expression is a function or other expression that you want to apply to the variable.

Example

Suppose an airline has decided to give passengers more leg room. The airline must ...