Table 1. Cluster statistics for each province.
(Top) For each of the four Canadian provinces: number of clusters in the data, number of schools reported, number of schools with multiple clusters, fraction of schools with multiple clusters. (Bottom) Fraction of clusters with one case, mean observed cluster size, maximum observed cluster size, and index of dispersion (variance of number of cases divided by mean number of cases) with and without subtracting one for the index case.
| Province | Number of Clusters | Number of Schools | Schools with Multiple clusters | Fraction of schools Multiple clusters | |
|---|---|---|---|---|---|
| Manitoba | 1754 | 542 | 396 | 0.73 | |
| Saskatchewan | 1211 | 466 | 295 | 0.63 | |
| Ontario | 8482 | 3337 | 2147 | 0.64 | |
| Alberta | 5032 | 1537 | 1158 | 0.75 | |
| Province | Fraction with | Mean observed | Max observed | Index of | IoD without |
| One case | Cluster size | Cluster size | Dispersion (IoD) | Index case | |
| Manitoba | 0.58 | 2.16 | 44 | 3.44 | 6.43 |
| Saskatchewan | 0.66 | 1.70 | 16 | 1.23 | 2.98 |
| Ontario | 0.63 | 1.83 | 50 | 1.87 | 4.13 |
| Alberta | 0.47 | 2.45 | 108 | 4.94 | 8.35 |