An IERI – International Educational Research Institute Journal
Measure | Ordinal scale | Interval scale |
---|---|---|
Mother/father education | 1 = Grade 9 or below | 9 |
 | 2 = Grade 10 | 10 |
 | 3 = Grade 11 | 11 |
 | 4 = Grade 12 | 12 |
 | 5 = Certificate I–IV | 13 |
 | 6 = Diploma | 14 |
 | 7 = Degree of higher | 15 |
Mother/father occupation | Â | Â |
 | 1 = Senior management | 81.1a |
 | 2 = Other business manager | 56.6a |
 | 3 = Trades, clerks, sales and service staff | 40.4a |
 | 4 = Machine operators | 30.4a |