Codes and Frequencies
Most IPUMS data transformations are performed using variable harmonization tables that specify how each value in the source data is recoded. Some variables also require programming logic in addition to the harmonization table. The harmonization documents for this variable are:
GEO2_ NG2009 identifies the household's Local Government Areas (LGA) within Nigeria in 2009. LGAs are the second level administrative units of the country, after states. A GIS map (in shapefile format), corresponding to GEO2_ NG2009 can be downloaded from the GIS Boundary files page in the IPUMS International web site.
The full set of geography variables for Nigeria can be found in the IPUMS International Geography variables list. For cross-national geographic analysis on the first and second major administrative level of any country refer to GEOLEV1, and GEOLEV2. More information on IPUMS-International geography can be found here.
Comparability — General
Note that the Nigeria sample of 2009 is a household survey. The sample followed a two-stage, replicated and rotable design in which enumeration areas (EAs) demarcated for the 1991 Population Census served as the primary sampling units and households as the secondary sampling units. EAs are very low level geographic units in Nigeria. 30 EAs per state were randomly selected. In each EA, 15 households were selected randomly from a list of all households in the EA. In total, 450 households where selected for interview per state. Total, 16650 households from 1,110 EAs were selected for interview. The selected EAs were distributed across urban and rural areas.
Local Government Areas with populations less than 20,000 (based on the most recent sample year) were regionalized (combined) with neighboring LGAs within the same states to create units with populations greater than 20,000.
- All households
- Nigeria: 2009