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| reading_writing | Reading and writing achievement test data |
| science1 | Science achievement test data |
| science1.context.vars | Science achievement test data - Context variable names |
| science1.item.characteristics | Science achievement test data - Item characteristics |
| science1.items | Science achievement test data - Item names |
| science1.scales | Science achievement test data - Scale definition |
| science1.testlets | Science achievement test data - Testlet definition as dummy codes |