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The 1KA tool has clearly defined missing values in the 'DATA' - 'Browse' tab. When it comes to the missing data of a certain question – item non-response – the 1KA tool uses the following labels:
The missing values of individual questions that are marked with the above negative numbers, need to be distinguished from the invalid values (e.g. ''I don't know,'' ''I refuse to answer,'' etc.), which also have negative values (-99, -98 ...). They must also be distinguished from the value of the unit statuses, which apply to the entire survey completed by a respondent.
You can also set or change the missing values manually in the 'EDIT' - 'Settings' - Missing values' tab.