From: Testing Heaps’ law for cities using administrative and gridded population data sets
Continent | β | \(\sigma _{\beta }\) | γ | \(\sigma _{\gamma }\) |
---|---|---|---|---|
Africa | 1.77 | 0.05 | 0.78 | 0.09 |
Asia | 1.94 | 0.04 | 0.85 | 0.05 |
America | 1.96 | 0.04 | 0.97 | 0.07 |
Europe | 2.02 | 0.05 | 1.01 | 0.06 |