1991 Northern Ireland Household SAR

The 1991 Census of Northern Ireland was conducted on 21st April 1991.  All householders were required by law to complete the Census form with respect to each individual present or usually resident at that address on the night of the 21st April.

The Household SAR is a one per cent sample of households and all individuals in those households. It is a hierarchical file allowing linkages between individuals. The SARs were drawn from the fully coded set of census records returned by households and institutions. They therefore omit wholly imputed households and also households that were missed by the census.

The Household SAR also contains about 40 variables, similar to those in the Individual file. However, the structure of the file allows a large number of other variables to be derived.

The sampling strategy used is similar to that used in GB, however, while in GB only 10% of cases were fully coded in Northern Ireland all cases were fully coded.  Consequently the NI file was not drawn from a pre-existing 10% sample.

New variables have been created for the hierarchical household file since summary information about a household can be computed from data about the individuals in that household.