Complete SAS Programming Guide - Learn SAS and Become a Data Ninja - Macro Functions (%Index and %Upcase)

The video tutorial covers two macro functions in SAS: the index function and the upcase function. The index function is used to find the position of a character within a string, demonstrated with an example using macro variables. The upcase function is explained as a tool to convert text to uppercase, which is useful for case-sensitive operations in SAS. Examples are provided to illustrate the practical applications of these functions.

What is the primary purpose of the index function in SAS macros?

• To determine the position of a character within a string

• To convert a string to uppercase

• To find the length of a string

• To concatenate two strings

In the example provided, what is the position of the character 'V' in the string 'A very long value'?

• Position 4

• Position 1

• Position 2

• Position 3

Which of the following is NOT a valid argument type for the index function?

• Macro function

• Numeric value

• Macro variable reference

• Constant text

What is the main use of the upcase function in SAS macros?

• To change a macro variable's value to uppercase

• To split a string into multiple parts

• To convert a string to lowercase

• To find the position of a character in a string

Why is it often necessary to use the upcase function in SAS?

• To improve the readability of the code

• To ensure compatibility with case-sensitive comparison operators

• Because SAS does not support lowercase letters

• To reduce the size of the data set