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FILE STRUCTURE AND CONTENT However, at least one category (reference period) of the mandatory field must be present in a table for TableBuilder to retrieve data. Not Applicable Categories Most data items included in the TableBuilder file include a 'Not applicable' category. The classification values of these 'Not applicable' categories, where relevant, are shown in the data item list in the Downloads tab. The 'Not applicable' category generally represents the number of people who were not asked a particular question or the number of people excluded from the population for a data item when that data were derived (e.g. Hours usually worked is not applicable to people who weren't employed; likewise Age of wife/partner does not apply to one-parent families where there is not a wife or partner). Zero Value Cells Tables generated from sample surveys will sometimes contain cells with zero values because no respondents that satisfied the parameters of a particular cell in a table were in the survey. This is despite there being people in the general population with those characteristics. This is an example of sampling variability which occurs with all sample surveys. Relative Standard Errors cannot be generated for zero cells.
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