Controlling how NA values are treated

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A number of options and functions control how NA values are treated. For example:

• The options listed in Table: NA and Nonexistent Value Options.

• The NAFILL function returns the values of the source expression with any NA values appearing as the specified fill expression. You can include this function in an expression to control the format of its value.

• System properties listed in Table: System Properties Used When Working with NA Values.