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_TH identifies the household's districts within Thailand in 1990 and 2000. Districts are the second level administrative units of the country, after provinces. GEO2_TH is spatially harmonized to account for political boundary changes across census years. Some detail is lost in harmonization; see the comparability discussion. A GIS map (in shapefile format), corresponding to GEO2_TH can be downloaded from the GIS Boundary files page in the IPUMS International web site.
The full set of geography variables for Thailand can be found in the IPUMS International Geography variables list. For cross-national geographic analysis on the first and second major administrative level refer to GEOLEV1, and GEOLEV2. More information on IPUMS-International geography can be found here.
Comparability — General
Where boundaries changed over time, units were harmonized to create units with boundaries that remain stable over time. Where officially-defined departments have populations less than 20,000, they have been regionalized (combined) with neighboring departments.
Boundary changes for GEO2_TH are too numerous to list here, but users should be aware that there were changes over time.
Districts for 1980 are not included in GEO2_TH due to unavailability of district labels that match our district codes. For 1970, there are several unknown districts in the census microdata that could not be harmonized with GEO2_TH. 1970 is released as a year specific variable GEO2_TH1970, with available districts with their respective codes and all unknowns grouped within its province (first administrative level unit) as a separate category.
- All households
- Thailand: 1990, 2000