An IERI – International Educational Research Institute Journal
Table 3 First stage summary statistics
| Â | Mean | Standard deviation | Minimum | Maximum |
|---|---|---|---|---|
Output variables | ||||
 Mathematics achievement score | 472.93 | 75.48 | 215.96 | 746.79 |
 Science achievement score | 479.08 | 77.84 | 191.75 | 690.79 |
School-level input variables | ||||
 General resource availability (TIMSS index varies from 0–1) | 0.72 | 0.20 | 0.25 | 1.00 |
 Number of computers | 72.86 | 96.10 | 0.00 | 1612.00 |
 Annual instructional hours | 1034.30 | 194.27 | 435.00 | 2430.00 |
 Home educational resources (Scale provided by TIMSS) | 10.28 | 1.03 | 5.61 | 13.20 |
 Share of students speaking the language of test (25% or less = 1, 26 to 50% = 2, 51 to 75% = 3, 76 to 90% = 4 and 90% or above = 5) | 1.96 | 1.46 | 1 | 5 |