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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XII, Part II (1899)

Chandler, Charles H.
The inter-generation period,   pp. [499]-504 PDF (2.2 MB)


Page 503


The Inter- Generation Period.
503
located. Neglecting, then, the first three generations presented,
the mean of the remaining periods is 33.3.
B
F
  X    11  1586  24     90
  IX    21  1610 36     101
VIII   40  1646  30     98
VII   33   1676 35    100
VI    27  1711 33     93
  V    16  1744  32     98
  IV    8   1776 28     100
  III    4  1804  38
  II    2  1842  34
  I    2   18766
       164
 Mean period ............... 32.9
 Omitting generations VIII,
 IXand       ..      .... 33.3
VI    9   1602 28     94
V    14  1630  31    103
IV    13  1661 35     95
III    7  1696  37
II    3  1733  '3
I    2   1756
II   11  1790  34
III   64  1822  32
IV   113  1855 33     99
V   167  1880  25    90
      403
Mean period...30.9
Omitting first and last gen-
orations.................. 32.1
  The graphic representation of this family may be examined
from a somewhat different point of view. Opposite the place
of the earliest ancestor of each name is given the mean period
computed on the line from that ancestor to the common descend-
ants in which all the lines unite. These fifty-seven periods lie
between-the-extremes-273 an& 3£.7, and they give a mean value
of 33, if the line from each ancestor is allowed the same weight,
a course which perhaps is hardly correct, since some of these
lines include many more generations than others. But it is
largely true that these long lines have become known not merely
by favoring accident, but because a tendency to early marriages
brought more generations within the time and conditions limit-
ing the research, which gives these families an undue influence
in the determination. It may, therefore, be just to allow these
two considerations to balance. But, if each line be given a
weight proportional to the number of generations included, the
corrected mean becomes 31.5.
  Table E presents five generations of the ancestors and four
generations of the descendants of the couple represented by gen-
eration I, and gives a mean inter-generation period of 30.9. But
 - - , loppopm-l- - - --   - --- ?---
I


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