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The classification criteria 13. The criterion used in classifying persons by age is the calculated time unit in complete years. The standard classification 14. 'Age' is a flat classification containing one level with as many categories as needed for a particular collection or topic.
The code structure 16. The code structure is 0 to 99. In ABS collections, 'Age' has no provision for 'Not stated/Inadequately described' and a 'best estimate' is generally provided for age, by either imputation, based on other related variables on the questionnaire, or any responsible adult (ARA) respondents. Note that data from sources which have a 'Not stated' code for 'Age' may include a 'Not stated' category in output. Alternatively, the 'Not stated' response may be incorporated into totals, providing that the 'Total' is footnoted to show it includes these responses (see topic Output).
Residual categories and codes 18. There are no residual categories associated with this classification. Supplementary codes 19. There are no supplementary categories associated with this classification. 20. The variable 'Age' applies to all persons. 21. The prime purpose of the 'Age' classification is to produce data items which measure or indicate a person's age in years. However, the classification may be applied to a variety of variables such as Age on Arrival, Age of Reference Person, etc. In general, the classification can be applied if the variable has data ranging from 0 to 99 (and over) years of age.
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