| cluster sampling | |
| math. | campionamento a grappolo; campionamento a piu stadi; selezione a piu fasi |
| stat. | campionamento a grappoli |
|
multistage : 27 phrases in 11 subjects |
| Earth sciences | 4 |
| Electronics | 1 |
| General | 4 |
| Information technology | 1 |
| Mathematics | 1 |
| Mechanic engineering | 3 |
| Medical | 1 |
| Metallurgy | 2 |
| Pharmacy and pharmacology | 1 |
| Statistics | 6 |
| Taxes | 3 |