Microdata are small samples of data for whole households and individuals.
Microdata products include some associated census characteristics but no information that could identify a household or individual.
Microdata products enable researchers to look at combinations of characteristics that are not generally available from the standard census tables, and to perform different types of analyses not possible from standard tabulations.
The microdata teaching file contains 1% of the person records from the 2011 Census in Northern Ireland, and was created for training students.
The secure microdata files consist of random samples of 10 per cent of people or households in the 2011 Census output database for Northern Ireland.
The safeguarded microdata files consist of random samples of up to 5 per cent of individuals in the 2011 Census output database for Northern Ireland.