Table 2.
Generation Intervals between the Contemporary and Ancestor Cohorts
|
Ancestor Cohort |
||||
| 1848–1892 |
1698–1742 |
|||
| Parameter andStatistic | Matrilines | Patrilines | Matrilines | Patrilines |
| Total years:a | ||||
| Mean | 122.6 | 121.0 | 268.4 | 268.0 |
| SD | 13.0 | 13.8 | 14.8 | 14.1 |
| N | 58,832 | 57,686 | 39,615 | 47,335 |
| No. of generations:a | ||||
| Mean | 4.27 | 3.80 | 8.8 | 7.9 |
| SD | .62 | .60 | .79 | .80 |
| N | 58,832 | 57,686 | 39,615 | 47,335 |
| Generation interval:b | ||||
| Mean | 28.12 | 31.13 | 28.72 | 31.93 |
| SD | 6.57 | 7.57 | 6.76 | 8.06 |
| N | 128,296 | 122,822 | 99,169 | 117,486 |
a
Cases represent each contemporary descendant and his or her ancestor.
b
Cases represent each unique mother-daughter or father-son pair in the matrilineal and patrilineal coalescent genealogies, respectively.