The Format defines the type
and structure of the variable. There are two kinds of variables: numeric
and alpha. Numeric variables may contain only numbers, while alpha
variables can use any character on the keyboard. Use N or A to specify a
variable as numeric or alpha, followed by the number of characters
needed to hold responses to the variable. For example, N2 would be a
numeric variable that could hold two digits, and A500 would be an alpha
variable that could hold up to 500 characters.
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