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:
GEO1_TH identifies the household's province within Thailand in all sample years.
Provinces are the first level administrative units of the country. GEO1_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 GEO1_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 of any country 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.
- In 1972, Phra Nakhon and Thon Buri provinces merged to form Bangkok Metropolis
- In 1972, Yasothon split from Ubon Ratchathani province
- In 1982, Mukdahan province split from Nakhon Phanom
- In 1993, Sa Kaeo split from Prachin Buri province
- In 1993, Amnat Charoen province split from Ubon Ratchathani
- In 1993, Nong Bua Lam Phu province split from Udon Thani
- In 1977, Chiang Rai province split from Phayao.
- Part of Chumphon province was in Ranong province in the 1970, 1980, and 1990 censuses.
- Parts of Surat Thani province was in Krabi province in the 1970, 1980, and 1990 censuses.
- All households
- Thailand: 1970, 1980, 1990, 2000