Statistics Canada
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Comparisons with previous editions

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”.)

Periodically, the weights are updated to reflect the availability of new population benchmarks provided by a new census. The most recent multi-year weight revision for the Survey of Labour and Income Dynamics and the Survey of Consumer Finance occurred with the release of data for 2003, when the population projections based on the 2001 Census of Population were incorporated.

The improvements to survey weights during the 2000 and 2003 historical revisions were part of a comprehensive project at Statistics Canada regarding the weighting strategies in the main annual surveys on income, expenditures, and wealth. Weights are typically adjusted using population benchmarks by province, age and sex. Since the 2000 weight revision, the weights in SLID also respect population benchmarks by household size and economic family size.

Since the 2003 revision, the weights from 1990 to the current period include adjustments based on the annual T4 file from Canada Revenue Agency (CRA), which is a compilation of employer remittances for the purposes of payroll taxes. For more, please refer to the free research paper, Survey of Labour and Income Dynamics: 2003 historical revision, Statistics Canada.