When a virtual field or calculated value can have missing values, you can specify whether all or some of the field values used in the expression that creates the DEFINE or COMPUTE field must be missing to make the result field missing. If you do not specify ALL or SOME for a DEFINE or COMPUTE with MISSING ON, the default value is SOME.
The SET parameter MISS_ON enables you to specify whether SOME or ALL should be used for MISSING ON in a DEFINE or COMPUTE that does not specify which to use.
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