Effect size | Shift of median to | ICCa | SD of random village effect | Child in every HH | Child in 50% HH |
---|
Power | Power |
---|
0.27 SD | P61 | 0.01 | 0.1 SD | 99% | 86% |
| 0.02 | 0.14 SD | 98% | 84% |
| 0.03 | 0.18 SD | 97% | 83% |
| 0.04 | 0.21 SD | 96% | 81% |
| 0.05 | 0.23 SD | 95% | 79% |
| 0.10 | 0.33 SD | 86% | – |
0.25 SD | P60 | 0.01 | 0.1 SD | 97% | 80% |
| 0.02 | 0.14 SD | 96% | 78% |
| 0.03 | 0.18 SD | 95% | 77% |
| 0.04 | 0.21 SD | 93% | 75% |
| 0.05 | 0.23 SD | 91% | 73% |
| 0.10 | 0.33 SD | 80% | – |
0.2 SD | P58 | 0.01 | 0.1 SD | 88% | – |
| 0.02 | 0.14 SD | 84% | – |
| 0.03 | 0.18 SD | 81% | – |
| 0.04 | 0.21 SD | 78% | – |
| 0.05 | 0.23 SD | 75% | – |
- Table 3 gives the achievable power for different effect sizes and intra class correlation coefficients. The expected power is given both under the assumption that a) a child under 5 years old will be found in each household, and b) that a child under 5 years old is found only in every other household. Intra-class coefficients reported in other African contexts range from 0.01 to 0.05
- SD standard deviation of individual growth rates
- aProportion of variance explained by the factor village