Comparability (geographic, over time)
Around twenty five per cent of all Collection Districts (CDs) undergo some type of change between Censuses. The types of changes which can occur include:
The extent of change is indicated in a variable on the Collection District Record Database. This can be used to approximate links between geographic areas over time.
- splitting a CD into two or more new CDs;
- amalgamating two or more CDs into a new CD; and
- varying the boundary of an existing CD.
The ABS has used this information to prepare a definition of 2001 SLAs which can be used with 2006 Census data. The Time-Series Profile, utilises this concordance.