Table 2. Summary of X2 and p values for the different datasets.
| Data type | Group X | Group Y | divergence times | X2 | d.f. | p (Χ2) | Χ2 (control) | p (Χ2) (control) | |||||
| c/plast - 51 | Eudicot (44) | Monocot (24) | ∼125mya | 289.0582 | 102 | 1.94E-19 | 93.68962 | 0.70943 | |||||
| c/plast - 51 | Angiosperm (25) | Gymnosperm (13) | ∼305mya | 363.5268 | 104 | 1.23E-29 | 85.64681 | 0.90482 | |||||
| c/plast - 51 | Seed plant (38) | Fern (7) | ∼390mya | 457.1184 | 102 | 1.69E-44 | 100.4507 | 0.52486 | |||||
| c/plast - 51 | Streptophyta (52) | Chlorophyta (6) | ∼700mya | 300.1617 | 94 | 2.23E-23 | 90.98169 | 0.56897 | |||||
| Nuclear - 7 | Vertebrata+Urochordata (9) | Echinoderms+Hemichords(10) | ∼600mya | 54.50034 | 14 | 1.05E-6 | 9.642275 | 0.78784 | |||||
| Nuclear - 7 | Deuterostomia (19) | Lophotrochozoa (12) | ∼670mya | 67.63153 | 14 | 5.17E-9 | 12.66025 | 0.55343 | |||||
| mitochond-12 | Neoaves (22) | Galloanserae (9) | ∼80mya | 99.55765 | 24 | 3.57E-11 | 16.03990 | 0.88663 | |||||
| mitochond-12 | Neognath (31) | Palaeognath (12) | ∼100mya | 102.5291 | 24 | 1.11E-11 | 23.69508 | 0.47914 | |||||
| combined | all 8 pairs of datasets | 1631.555 | 478 | 2.59E-132 | 432.8063 | 0.93172 | |||||||
| joint tree | Eudicot (44) | Monocot (24) | ∼125mya | 539.3154 | 102 | 1.51E-57 | |||||||
The numbers of genes for the subgroups are indicated after the data type, and the number of taxa are indicated in parentheses ‘()’following the group name. The divergence times are minimum estimates from fossils and molecular data. Columns 5–7 relate to the probability that convergence could have arisen by chance, the last two columns are from controls where convergence is not expected. The penultimate row gives the combined values for the 8 datasets. The final row gives the results for the first example where combined information from both subsets (eudicots and monocots) is used for estimating the ancestral sequence of both subgroups; this again indicates that our test is very conservative.