The Irish data, IRISH.DAT, were extracted from an extensive study of the attitudes of 1107 Irish children to their native language and their proficiency in the language
| 1 | school | school code |
| 2 | totalno | school identification number |
| 3 | size | school size |
| 4 | type | school type: secondary (1), community (2), vocational (3) |
| 5 | locat | school location: urban (1), rural (2) |
| 6 | sex | male (1), female (2) |
| 7 | income | income level: high (1), medium (2), low (3) |
| 8 | es | educational standard score |
| 9 | verbal | verbal reasoning score |
| 10 | voc | vocabulary: bad (1), poor (2), good (3), excellent (4) |
| 11 | usage | use of language: never (1), little (2), regular (3) |
| 12 | disc | aural discrimination: none (1), poor (2), ok (3), good (4), very good (5) |
| 13 | comp | aural comprehension: none (1), poor (2), good (3) |
| 14 | attit | attitude to learning Irish: negative (1), neutral (2), positive (3) |
| 15 | orient | integrative orientation: none (1), poor (2), ok (3), good (4) |
| 16 | motivat | motivational intensity: none (1), little (2), some (3), lots (4) |
| 17 | desire | desire to learn: none (1), little (2), some (3), lots (4) |