An IERI – International Educational Research Institute Journal
Table 1 Overview for cross-sectional OECD PISA data files and resulting total database of scalable cases for mathematics
PISA round | participating countries | Number of cases in files | math scalable students | ||||
|---|---|---|---|---|---|---|---|
OECD | non OECD | SCR\(^{\mathrm{a}}\) | SDQ\(^{\mathrm{a}}\) | OECD | non OECD | Total | |
2003 | 30 | 11 | 276 165 | 276 165 | 220 670 | 49 995 | 270 665 |
2006 | 30 | 27 | 398 750 | 398 750 | 251 278 | 147 472 | 398 750 |
2009 | 34 | 40 | 515 958 | 515 958 | 298 454 | 217 504 | 515 958 |
2012 | 34 | 31 | 485 490\(^{d}\) | 480 174 | 295 416 | 184 758 | 480 174 |
Number of cases that can be used for scaling: | 1 065 818 | 599 729 | 1 665 547 | ||||