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15.7.9.2 Missing Values for Summary Variables

For summary variables, values that are valid and in included categories are analyzed, and values that are missing or in excluded categories are not analyzed, with the following exceptions:

For categorical variables, system-missing values are never in included categories. For scale variables, there is no notion of included and excluded categories, so all values are effectively included.

The following table provides another view of the above rules:

VALIDNotherTOTALN
Categorical variables:
    Valid values in included categoriesyesyesyes
    Missing values in included categoriesyesyes
    Missing values in excluded categoriesyes
    Valid values in excluded categories
Scale variables:
    Valid valuesyesyesyes
    User- or system-missing valuesyesyes