Revisions to 2006 to 2011 income data
Conclusion
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This note presents revised income estimates for SLID from 2006 to 2011. These revisions to 2006-2011 estimates make it possible to compare results from the CIS to earlier years.
The revisions address the issue of methodological differences between SLID and CIS, and, in general, yield an upward revision in low-income rates. The upward revisions in low-income rates are larger in Toronto, and, correspondingly Ontario, and are also concentrated in other large CMAs. Most other estimates such as median income values are not changed significantly as a result of the revision.
Estimates from before 2006 together with the revised estimates remain suitable for analyzing long-term trends, and conclusions that would be drawn from the revised series are, in most cases, the same as those that would be drawn using the previous series.
In the implementation of the revision for 2006-2011, revisions to the data were made in such a way as to minimize “breaks” in trends. However, there is always the possibility of breaks occurring in trends whenever a new methodology is introduced. With this revision, changes to the methodology occur between 2005 and 2006 as the revision to SLID is implemented, and between 2011 and 2012 as CIS replaces SLID. Such a break would appear as a noticeable upward or downward shift in the data in these years. It would represent a change in the estimates which is attributable to the two surveys having differences which could not be fully adjusted for in this revision.
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