StatsCan Warns Audience to Compare Voluntary Survey with Mandatory Census at Own Risk

This article was last updated on April 16, 2022

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The first set of data reports from the 2011’s National Household Survey have been recently released with the census equivalent of a Surgeon General’s warning, which says that people shall make any historical comparisons at your own risk. Printed at the back pages of almost all Statistics Canada documents released on Wednesday, a disclaimer claims that the voluntary National Household Survey is fundamentally different in nature than the recently discontinued mandatory long-form census.

Previously the Harper government addressed a controversy issue back in 2010, when it concluded that the mandatory long-form census shall be replaced with a voluntary survey. Almost all demographers, analysts and insiders were agonized that the quality of the data collected will suffer as a result. The agency included the cautious warning on all the material released on Wednesday, which read that “the NHS estimates are derived from a voluntary survey and are therefore subject to potentially higher non-response error than those derived from the 2006 census long form.”

Especially while comparing the results of 2006 long-form and 2011 survey, the smallest communities had a visible and major difference, whereas on the other hand, the larger communities were relatively much more identical. Statistics Canada alleged that while comparing the results for smaller areas of 2006 and 2011, “there can be large discrepancies between the 2011 census population count and NHS population estimate.” The agency mentioned that “those discrepancies are due to weighting, and as in any survey, they may be larger for small geographic areas.”

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