What syntax is used to define the length of a variable in SAS?

The syntax for defining the length of a variable in SAS is significant as it determines how much storage space is allocated for that variable. When you use the LENGTH statement, specifying the data type is crucial, especially for character variables.

In the choice that states "LENGTH variable $ length;", the dollar sign ($) indicates that the variable is character type. This informs SAS to allocate space sufficient for the specified length of character data. For example, if you define "LENGTH name $ 20;", you are specifying that the variable 'name' can hold up to 20 characters. This is essential because it allows SAS to efficiently manage memory and ensure proper data storage.

In contrast, other options do not follow the correct syntax for specifying the length of character variables or define lengths incorrectly for numeric variables. As SAS uses specific conventions for defining variable types, understanding the correct use of symbols like the dollar sign is key to properly defining variable lengths in your datasets.