Question

What does the PREFIX= option do for PROC TRANSPOSE? How does it affect the names of the output variables when used in conjunction with the ID statement?

a) The PREFIX= option adds a prefix to all output variable names. When used with the ID statement, it creates unique variable names with the prefix.
b) The PREFIX= option controls the order of observations. When used with the ID statement, it combines the prefix with the variable name.
c) The PREFIX= option specifies the variable to be transposed. When used with the ID statement, it replaces the variable name with the prefix.
d) The PREFIX= option renames the output dataset. When used with the ID statement, it assigns the same prefix to all output variables.

Answer 1

The PREFIX= option in PROC TRANSPOSE adds a specified prefix to the output variable names. When used with the ID statement, it results in unique variable names starting with that prefix, along with the value from the ID variable. Thus, the correct option is A.

Step-by-step explanation:

The PREFIX= option in PROC TRANSPOSE is used to add a prefix to the names of the output variables created as a result of the transposition process.

When the ID statement is used in conjunction with the PREFIX= option in PROC TRANSPOSE, this combination aids in creating unique variable names that start with the specified prefix, followed by a value from the ID variable.

Therefore, the correct answer to this question is (a) The PREFIX= option adds a prefix to all output variable names. When used with the ID statement, it creates unique variable names with the prefix.

Answer 2

The PREFIX= option in PROC TRANSPOSE adds a specified prefix to the names of the output variables. When used with the ID statement, it creates unique and identifiable names for the transposed variables by combining the prefix with the values of the ID variable.

Step-by-step explanation:

The PREFIX= option in the PROC TRANSPOSE procedure in SAS is used to add a specified prefix to the names of output variables that are created as a result of the transposition process. When the PREFIX= option is used in conjunction with the ID statement, each transposed variable is assigned a name that consists of the prefix followed by the value of the ID variable for its corresponding column in the input dataset. Therefore, it ensures that the variable names are unique and easily identifiable in the transposed dataset.

For example, if the PREFIX='Year_' is used and the ID variable has values '2019', '2020', and '2021', the output variables will be named 'Year_2019', 'Year_2020', and 'Year_2021', respectively. This is helpful when we want the variable names in the output dataset to reflect specific attributes related to the ID values.