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Should I use Area of Enumeration Data or Usual Residence Data?
The Census is collected on a “Place of Enumeration” basis. This means that wherever you are staying on Census night is where you fill in a form and are counted. One of the questions on the Census form also asks “Where does the person usually live?” Responses to this can be the same as the current location (place of enumeration) or at a different address entirely. In effect, this creates two different sets of data. The enumerated dataset is a count of where people actually were on Census night. The usual residence dataset records where people usually live. Both sets of data have different uses and advantages, allowing them to be used in different situations.
What is Area of Enumeration Data?
The place of enumeration is the place at which the person is counted i.e. where they spent Census Night, which may not be where they usually live. It is considered neither a person, family nor dwelling level variable but rather a geography and can be applied to all levels of data, allowing access to data on person, dwelling and household topics. Census counts based on place of enumeration can be provided for individual Mesh Blocks (MBs), and any aggregations of Mesh Blocks, such as postal areas or Statistical Areas Level 2 (SA2s) or above. This means that an Area of Enumeration data set can be as small as a single suburb or as large as Australia as a whole. A detailed description of place of enumeration can be found in the 2016 Census Dictionary.
Area of enumeration data provides a good representation of any given day in time because there will always be people visiting, occupying non-private dwellings, travelling, etc. that are not apparent when usual residence data is used. This can provide insight into atypical situations, such as holiday resort areas; areas like the Gold Coast or snow fields in winter, which may show a larger place of enumeration count compared with their usual residence count.
What is Usual Residence Data?
A place of usual residence (PURP) refers to the area where a person usually lives regardless of where they were on Census Night. It is NOT considered a geography; rather it is considered a person level variable and therefore can only be applied to persons
Usual residence data records where people usually live based on Census night. This means you are only dealing the data from the residents of a particular area, not that of visitors. Because of the nature of usual residence data and how it is collected, it is less likely to be impacted by seasonal influences. This is useful for organisations which use the locally resident population, for example the age structure of the people who live in a certain area can be used to determine the allocation of funds for health services to a region.
In the two tables below we can set the total populations for four areas in Queensland at the SA3 geography level. The Area of Enumeration table contains the total number of persons residing in each SA3 on Census night, including overseas visitors and guests. The Usual Residence table contains the total number of residents that usually live in dwellings located in these specific geographic areas.
As seen in the tables, certain areas contain an increased total population when looking at place of enumeration. Areas such as Surfers Paradise and Brisbane Inner have larger enumerated populations when compared with their usual residence totals, most likely due to an influx of tourists and visitors. This is not always the case, however. Certain places such as Townsville or Toowoomba might have their populations remain static over Census night, with little or no increase in their total populations. In some cases the Enumerated population might even be smaller than the usual residence.
One reason that the Census is typically carried out on an August date is with the aim of minimising the impact of travel, avoiding major public holidays and school holidays. When large numbers of people are away from their usual residence, it increases the difficulty of data collection.
Why can’t I count Families or Dwellings using Place of Usual Residence?
Firstly, a dwelling does not move. It does not have a ‘place of usual residence’. Likewise, all the variables associated with a dwelling belong to that particular dwelling and cannot be moved. It is not logical to count the number of bedrooms in a dwelling by usual residence. The number of bedrooms belongs to a particular dwelling and they do not move, regardless of whether the people within them do.
Secondly, using ‘place of usual residence’ will produce a number that is misleading and likely to be incorrectly interpreted.
For example: Using the illustration below, imagine there are five dwellings with male and female residents represented as outline figures. Now count the number of dwellings by sex:
This would produce a table showing the count of dwellings containing females as four and the count of dwellings containing males as four, insinuating a total of eight dwellings. However there are only five dwellings altogether, not eight.
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