Age is the length of time a person has been alive. --
Variable name: Age Definition: Age is the length of time a person has been alive, measured in complete elapsed years. It is measured as the difference between 'date of birth' and '6 March 2001'.
Questionnaire: Date of birth is collected on the Individual form (Question 4) and age is collected on the Dwelling form (question 4) Subject population: Census Night Population Count. There were 3,820,749 people in New Zealand on Census night - all of whom have age derived for them. Non-response: Age is imputed for non response to year of birth question. Quality level: Age is a foremost variable.
3.7% age imputation for usually resident population compared with 3.9% in 1996. Substitute forms increase the level of age imputation. Recognition rate of the date of birth variable was over 99.7%. Comparability with previous census data: Age data is comparable with the results of previous censuses
Things to be aware of: Age is derived from date of birth. There are inconsistencies between Date of Birth, Age on the Dwelling Form, Years at Usual Residence and Years Since Arrival in New Zealand. No consistency edits were applied to the data in 2001.
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