| Estimate | Std. error | t value | Pr (. > |t|) |
---|---|---|---|---|
(a) | ||||
 Intercept | 2.4541 | 0.0861 | 28.50 | 0.0000 |
 Spanish Coastal | − 1.4147 | 0.2290 | − 6.18 | 0.0000 |
 South Tunisian Coastal | − 0.7222 | 0.2367 | − 3.05 | 0.0026 |
 Greek | 0.6017 | 0.1636 | 3.68 | 0.0003 |
 Spanish-Moroccan Inland | − 0.8518 | 0.1804 | − 4.72 | 0.0000 |
 r2 = 0.31. P = 2.2 × 10−16 | ||||
(b) | ||||
 Intercept | 2.7362 | 0.1237 | 22.12 | 0.0000 |
 Algiers | − 1.2335 | 0.2816 | − 4.38 | 0.0000 |
 Spanish Coastal | − 1.1635 | 0.2353 | − 4.95 | 0.0000 |
 North Tunisian Coastal | − 1.4798 | 0.3648 | − 4.06 | 0.0001 |
 Atlas | − 0.7511 | 0.1918 | − 3.92 | 0.0001 |
 French | − 0.5753 | 0.1963 | − 2.93 | 0.0038 |
 Greek | − 0.3084 | 0.1812 | − 1.70 | 0.0906 |
 r2 = 0.19. P = 1.8 × 10−7 |