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Missing values
For a discussion about missing values, see SAS Language Reference: Concepts. Information about handling missing values is also in PROC TABULATE by Example.
ODS
For complete documentation on how to use the Output Delivery System, see SAS Output Delivery System: User's Guide.
PROC TABULATE
See the TABULATE procedure in the Base SAS Procedures Guide.
For a detailed discussion and comprehensive examples of the TABULATE procedure, see PROC TABULATE by Example.
SAS formats
See SAS Formats and Informats: Reference. Many formats are available with SAS, such as fractions, hexadecimal values, roman numerals, Social Security ...

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