Statistical disclosure control

While most Census outputs take the form of statistical counts, there is a risk that information about an individual person could be deduced from Census outputs. For example, if everybody in a particular geographic area was aged under 50 apart from one old-age pensioner living in a single person household, a cross-tabulation of age and general health would reveal the response of that pensioner to the Census question on general health. The Census form gives respondents an assurance that their information will be treated as confidential, and statistical disclosure techniques are employed to ensure that the risk of inadvertent disclosure in statistical outputs is minimised.