Ancestor coverage table

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The table below counts the number of direct lineal ancestors about whom some information is known (the count is inaccurate for the remotest medieval generations, where not all lines have been entered into the GEDCOM file from which this count was generated, and no ancestors beyond the 21st generation, which includes Edward III of England and Philippa of Hainault, have been entered).

Ancestor Coverage Table for Henry, Ruth Kendrick, and Elizabeth Emily Churchyard by generation:

The following are the meanings of the terms in the table ("Diff" and "Unique" are only given when different from "Found"):

"Total"
the total number of potential ahnentafel slots in a generation (always a power of 2).
"Found"
the number of ahnentafel slots actually filled in each generation.
"Diff."
the number of different individuals in each generation (a single individual may fill more than one slot, due to cousin internarriage in more recent generations).
"Unique"
the number of new individuals in each new generation (who are not also present in any more recent generation). When "Unique" is different from "Diff", this is due to intermarriage between "removed" cousins of different generations in more recent generations.
"Percentage"
the ratio "Found"/"Total", expressed as a percentage.

Gen  Total       Found    Diff.   Unique   Percentage

0    1              1                        100.00 %
1    2              2                        100.00 %
2    4              4                        100.00 %
3    8              8                        100.00 %
4    16            16                        100.00 %
5    32            30                         93.75 %
6    64            44       42                68.75 %
7    128           61       57                47.65 %
8    256           90       82                35.15 %
9    512          126      114                24.60 %
10   1024         149      139       135      14.55 %
11   2048         176      169       155       8.59 %
12   4096         117      111        95       2.85 %
13   8192          49       47        41       0.59 %
14   16384         23       23        22       0.14 %
15   32768         13                          0.03 %
16   65536         10                          0.01 %
17   131072         6                          0.00 %
18   262144         9                          0.00 %
19   524288        10                          0.00 %
20   1048576       11                          0.00 %
21   2097152        5                          0.00 %

All               960                868

(Based on 10/27/97 version of GEDCOM.)


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