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Variable Groups are used to group together closely related variables. Under the DDI each system of categories is defined as a separate variable, so for example a variable categorising ages into five year bands running up to '95 and over' is a separate variable from one giving ages to '100 and up'. However, we group these into a single Variable Group covering ages.
Themes, which organise the database into broad topics:
| Entity ID | Entity Name |
|---|---|
| T_LAND | Agriculture & Land Use |
Variables, defining what data was gathered for :
| Entity ID | Entity Name |
|---|---|
| V_CROP_GEN | Generalised Crop Categories |
| V_CROP1801 | 1801 Crop Return categories |
| V_CROP1801_TOTAL | 1801 Crop Return Category Total |
| V_AGCEN_CROP_GEN | Agricultural Census Generalised Crop Categories |
| V_AGCEN_CROP_1866 | Agricultural Census Crop Categories for 1866 |
| V_AGCEN_CROP_1869 | Agricultural Census Crop Categories for 1869 |
| V_AGCEN_CROP_1871 | Agricultural Census Crop Categories, 1871- |
| V_AGCEN_CROP_1881 | Agricultural Census Crop Categories, 1881- |
| V_AGCEN_CROP_1891 | Agricultural Census Crop Categories, 1891-1901 |
| V_AGCEN_CROP_1910 | Agricultural Census Crop Categories for 1910 |
| V_AGCEN_CROP_1920 | Agricultural Census Crop Categories for 1920 |
| V_AGCEN_CROP_1922 | Agricultural Census Crop Categories, 1922- |
| V_AGCEN_CROP_1940 | Agricultural Census Crop Categories, 1940-42 |
| V_AGCEN_CROP_1950 | Agricultural Census Crop Categories, 1950-51 |
| V_AGCEN_CROP_1957 | Agricultural Census Crop Categories, 1957-60 |
| V_AGCEN_CROP_1961 | Agricultural Census Crop Categories, 1961-3 |
| V_AGCEN_CROP_1970 | Agricultural Census Crop Categories for 1970 |
| V_AGCEN_CROP_S_1931 | Agricultural Census Crop Categories for 1931 |
| V_AGCEN_CROP_S_1961 | Agricultural Census Crop Categories for 1961 |
| V_AGCEN_CROP_I_1871 | Agricultural Census Crop Categories, 1871- |