Microdata are small samples of data for whole households and individuals, which 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.
As with previous Censuses, NISRA is committed to producing Microdata Samples of Anonymised Records (SARs) from the 2011 Census. This work is being advanced collaboratively with the other UK Census Offices and in conjunction with key users.
Three levels of microdata have been released for 2011 Census:
This file contains anonymised records on a limited set of variables for a random sample of 1 per cent of people in the 2011 Census output database for Northern Ireland.
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.