Table 2 Analysis of high/low clustering for different years using Getis-Ord Gi* statistic
Year | Observed | Expected | variance | Z-score | P-value |
|---|---|---|---|---|---|
2007 | 0.00963 | 0.00320 | 0.000017 | 12.2138 | <0.01 |
2008 | 0.00554 | 0.00320 | 0.000002 | 7.3240 | <0.01 |
2009 | 0.00512 | 0.00320 | 0.000003 | 5.2544 | <0.01 |
2010 | 0.00422 | 0.00320 | 0.000002 | 3.3341 | <0.01 |
2011 | 0.00523 | 0.00320 | 0.000004 | 4.846 | <0.01 |