Table 3.
Coverage probability of the Wald 95% confidence interval of PR for delta method and bootstrap varying the degree of correlation, number and size of clusters.
| Sample Size |
ICC = 0.03 | ICC = 0.29 | ICC = 0.71 | |||
| Delta | Bootstrap | Delta | Bootstrap | Delta | Bootstrap | |
| Number of clusters = 10 | ||||||
| m = 10 | 94.7% | 88.3% | 92.7% | 88.0% | 95.0% | 87.3% |
| m = 30 | 93.7% | 93.0% | 91.7% | 88.3% | 92.0% | 89.0% |
| Number of clusters = 30 | ||||||
| m = 10 | 95.3% | 94.0% | 90.3% | 91.0% | 93.3% | 92.0% |
| m = 30 | 92.3% | 90.0% | 94.0% | 93.3% | 94.0% | 93.6% |
| Number of clusters = 100 | ||||||
| m = 10 | 94.3% | 94.3% | 92.7% | 94.0% | 91.8% | 92.5% |
| m = 30 | 93.9% | 92.9% | 95.7% | 95.3% | 95.0% | 94.3% |