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See Crunch Automation basics for more information.

The ADD CATEGORIES command allows you to add extra empty categories to categorical variables. The new categries must have a code and a label that does not currently exist in that variable. All the variables mentioned must have the same categories.

ADD CATEGORIES ON alias, ..., alias
    LABEL "string" CODE code [MISSING],
    ...
    LABEL "string" CODE code [MISSING];

Example

ADD CATEGORIES ON awareness, product_awareness
    LABEL "Not Asked" CODE 8 MISSING,
    LABEL "Not Answered" CODE 9 MISSING;