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:
MIG1_1_PT indicates the person's subregion of residence one year ago within Portugal using the Eurostat NUTS-3 classification, slightly modified.
Click on the Source Variables tab for information on place of residence for each sample year. Source variables may contain more geographic unit detail but are not suitable for cross-temporal comparison.
Comparability — General
There are no comparability issues. In each sample the period of reference is somewhat more than one year. The censuses asked for the person's place of residence on December 31 two calendar years prior to the census. Since the censuses were taken in March or April, the variable actually records residence roughly 15 months ago.
For the country of residence of international migrants, see MIGCTRY1 (Country of residence 1 year ago).
- Persons age 1+
- Portugal: 1981, 1991, 2001, 2011