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Reading skills of young immigrants in Canada: the effects of duration of residency, home language exposure and schools - June 2008

Appendix B

Data collected under the Programme for International Student Assessment (PISA) used a complex sampling design (stratified, two-stages sampling). A balanced repeated replication methodology (BRR) was employed to estimate the sampling variances of PISA estimates. This resulted in a set of 1,000 BRR weights which were available in the data file and were used throughout this report.

The PISA data set contained plausible values. Plausible values are not test scores, they are random values that are drawn from distribution of scores that could be reasonably assigned to each individual. Plausible values are better suited to describing the performance of the population than a set of scores that are optimal at the individual level. In PISA, each performance outcome was measured by a set of five plausible values. The analyses performed in this report used the plausible values. For more information on PISA sampling methodology refer to the PISA 2000 Technical Report (OECD, 2002a and OECD, 2002b).

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Date Modified:
2008-06-11