Dictionary, Census of Population, 2016
Historical comparability rule
Description of Figure 1.10
Figure 1.10 is a graphical representation of the historical comparability rule (rule 5Figure 1.10 - note 1) for delineating a census metropolitan area (CMA). Two fictional groupings, layered one on top of the other, of 12 census subdivisions (CSDs) shown as polygons labelled 'A' through 'L,' represent the group of CSDs that could form a CMA. Both groupings are identical except the grouping on top is labelled 'Current census' while the grouping underneath is labelled 'Previous census' and the CSD L was not in two parts.
All of CSD A and a small portion of the adjacent CSDs B and J are shaded to represent a population centre. This population centre also makes up the core of the CMA. Census subdivision D has a small, shaded polygon within it that identifies a population centre that is not part of the core and is therefore referred to as fringe.
An arrow extends from CSD I in the previous census layer to CSD I in the current census layer to represent the inclusion of CSD I in the current version of the CMA since it was included in the previous CMA.
A thick black line outlines the perimeter of CSDs A, B, C, D, E, F, G, H, I and excludes CSD K, leaving a hole, to identify the new boundary of the CMA.
Two legends appear below the figure. The legend on the left identifies the symbols used in the figure to represent the boundaries of the CMA, CSD, population centre, core and fringe. The legend on the right distinguishes which CSDs are included in the CMA by which rule. For this figure, CSDs A and B are included under rule 1 (delineation core rule), CSD C is included under rule 2 (forward commuting flow rule), CSD D is included under rule 3 (reverse commuting flow rule), CSDs E, F, G and H are included under rule 4 (spatial contiguity rule), and CSD I is included under rule 5 (historical comparability rule).
Source: Statistics Canada, 2016 Census of Population.
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