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Data from different editions are not directly comparable. Every edition has some modifications done on data. The modification which is applied every year is the expression of all dollar amounts in constant dollars of the latest reference year. (See "Current dollars versus constant dollars".)
The 2010 release is accompanied by a historical revision for 2006 to 2009. The SLID sample weights and estimates for 2006 and the years following are now produced on the basis of population counts from the 2006 Census of Population, instead of the 2001 Census. As a result, all estimates in the CANSIM 202 series have been revised for reference years 2006 to 2009. While the actual levels of the estimates have changed in many cases, generally, the trends shown by the data remain very similar.
The following table presents the impacts of the revision on some key national estimates for the reference years 2006 and 2009. Because the impacts on 2007 and 2008 estimates were similar, they were omitted from the table. A research paper provides more information about the impact of this revision (Statistics Canada, forthcoming). It should be noted that survey estimates prior to 2006 were not revised.
| 2006 | 2009 | |||||
|---|---|---|---|---|---|---|
| pre-revision | post-revision | % changeNote 1 | pre-revision | post-revision | % changeNote 1 | |
| Earnings | ||||||
| Number of earners ('000) | 18,863 | 18,837 | -0.1 | 19,477 | 19,451 | -0.1 |
| Number of full-time full-year earners ('000) | 9,072 | 9,041 | -0.3 | 8,916 | 8,889 | -0.3 |
| Median earnings, all earners (2009 constant dollars) | 28,200 | 28,200 | 0.1 | 28,700 | 28,700 | 0.1 |
| Median government transfers (2009 constant dollars) | ||||||
| Economic families | 4,800 | 4,800 | 0.1 | 6,200 | 6,200 | 0.7 |
| Unattached individuals | 700 | 700 | 0.0 | 1,700 | 1,600 | -3.8 |
| Median income tax (2009 constant dollars) | ||||||
| Economic families | 9,400 | 9,400 | 0.3 | 7,900 | 7,900 | 1.1 |
| Unattached individuals | 2,200 | 2,200 | -2.0 | 2,300 | 2,200 | -1.6 |
| Median after-tax income (2009 constant dollars) | ||||||
| Economic families | 61,100 | 61,200 | 0.1 | 63,800 | 64,200 | 0.6 |
| Unattached individuals | 23,900 | 23,700 | -0.7 | 25,500 | 25,400 | -0.3 |
| pre-revision | post-revision | percentage point change | pre-revision | post-revision | percentage point change | |
| Percentage of persons in low income | ||||||
| Low Income Cut-off | 10.5 | 10.3 | -0.2 | 9.6 | 9.5 | -0.1 |
| Low Income Measure | 12.6 | 12.4 | -0.2 | 13.3 | 13.1 | -0.1 |
| Market Basket Measure | 10.0 | 9.9 | -0.1 | 10.6 | 10.5 | -0.2 |
| Income share by adjusted after-tax income quintile (%) | ||||||
| Lowest quintile | 6.8 | 6.8 | 0.0 | 6.7 | 6.7 | 0.0 |
| Second quintile | 12.4 | 12.4 | 0.0 | 12.3 | 12.4 | 0.1 |
| Third quintile | 17.3 | 17.3 | 0.0 | 17.4 | 17.5 | 0.1 |
| Fourth quintile | 23.4 | 23.4 | 0.0 | 23.5 | 23.5 | 0.0 |
| Highest quintile | 40.2 | 40.1 | -0.1 | 40.1 | 39.9 | -0.2 |
| 1. Percentage changes were calculated using unrounded numbers. | ||||||
As opposed to the Low Income Cut-offs and the Market Basket Measure which do not depend on the SLID samples, the Low Income Measures (LIMs) were recalculated for that period. Impact of the revision on the LIM is described in the 2010-2011 Low Income Lines report.
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