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2011 CORRESPONDENCES PRODUCT BRIEF
* in some cases the Area type is two characters, eg "CD", adjust character count appropriately
CA2011SLA_2006CD.txt is the text file containing the information concording 2006 Census Collection Districts (CD) to 2011 SLAs based on the area correspondence principal.
Note. These files are sometimes known as a CD 2006 to SLA 2011 correspondence, but the ABS express these in the format of 2011 SLA from 2006 CD because this is the order the data appears in the file.
File Format for Standard Correspondences
Correspondence files are comma-delimited text files.
Field Names will vary from file to file but are consistent in nature. The field name is constructed from the area type and date. For example the code field from the 2011 SLA file will have the name "SLA_MAINCODE_2011", and the name field from the 2011 SLA file will have the name "SLA_NAME_2011".
It is important to note the placement/ positioning convention as it is similar to the file naming convention.
Ratio - figures expressed as part of 1 - actual figures can be up to 10 decimal places.
Percentage - figures expressed as a percentage ranges from 0 to 100.
An example of how to interpret the files is described below. The example is from the area based correspondence CA2011SLA_2006CD.txt.
The estimated value to 2011 SLA Cherbourg (S) data would be:
315102330 Cherbourg (S) = 3101610 data multiplied by 0.0003086
315102330 Cherbourg (S) = 3101611 data multiplied by 1
315102330 Cherbourg (S) = 3101612 data multiplied by 0.99942
Please remember these are area based correspondences and therefore are giving the ratio/percentage of the CDs physical area that is within the 2011 SLA's physical area. This example indicates a small misalignment where only a small amount (0.0308615%) of CD 3103610 is within the 2011 SLA of Cherbourg (S). The majority of the SLA is made up of CDs 3101611 and 3101612.
Please note the correspondence CA2011SLA_2006CD.txt has two fields containing CD_CODE_2006. This is due to the fact that CDs do not have a name, however the program needs two of the columns populated, and therefore the CD_CODE_2006 has been duplicated.
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