IPUMS harmonized migration variables
IPUMS now provides harmonized migration variables coded to match the corresponding harmonized place-of-residence variables at the first administrative level for each country. In addition, a set of global migration variables combine all relevant country-specific codes into one variable to facilitate cross-national analysis of intra-national migration. The codes in the global migration variables correspond to those in GEOLEV1, the global place-of-residence variable.
The first three digits of the migration variables correspond to the three-digit COUNTRY code and the last three digits specify the geographic unit within country. Leading zeros are used when the geographical unit within the country requires less than three digits. Foreign migrants are always coded as 097 or 997 and unknown codes are 098 or 998 preceded by their three-digit country code.
Currently IPUMS only provides harmonized migration data at the first-administrative level within each country. We intend to develop second-administrative level migration variables wherever possible in the future. Additionally, to eliminate redundant variables with differing codes, we will phase out the old country-specific migration variables that were not fully harmonized spatially. Originial unharmonized sample-specific migration data will remain available via the source variables.
All new migration variables can be mapped. Click here to download the appropriate GIS shapefile. Use field "GEOLEVEL1" in the attribute table to join the migration data to the shapefiles. Note that foreign places and missing value codes do not have corresponding "GEOLEVEL1" codes in the GIS shapefile.
Global migration variables
The following variables combine all relevant data into one mappable international variable recording previous residence at the first administrative level. Although these are multi-national variables, they only record migrations within each country's borders. Their primary use is for comparative subnational migration research. International migration is available in a corresponding set of variables (e.g., MIGCTRY1, Country of residence 1 year ago).
- GEOMIG1_P, previous residence (no time reference)
- GEOMIG1_1, residence one year ago
- GEOMIG1_5, residence five years ago
- GEOMIG1_10, residence ten years ago
Country-specfic migration variables: Iran example
|MIG1_P_IR||Province of previous residence, Iran; consistent boundaries, GIS||Corresponds to GEO1_IR|
|MIGRATEP||Migration status, previous residence||Calculated from source migration variables|
|MIGIR||Province of previous residence, Iran||Not spatially harmonized.
Will be phased out