2024 Ancestor Score Completeness Statistics

Geneanet defines the Ancestor Score as 

“comparing the number of possible ancestors with 

the number of identified ancestors on a 10-generation report”. 

Inspired by the Ancestor Score - or “Completeness Statistics” - of other blogs and GeneaNet's definition above, I generated my first one in February 2016. Since then I haven't just been able to linearly increase my known ancestors. Instead, I had to remove a whole line of wrong ancestors in 2018.

I could only partially replace them by already existing ancestors - due to inbreeding among my ancestors. Therefore, I decided to generate a new in-between ancestor score in August 2018 to be able to continue this series of posts (and removed the wrong one of 2017). Since then I've been gradually able to increase my number ancestors.

The generation with the most known ancestors is the 13th generation with just 21% of the theoretically maximum number of ancestors in that generation. In the 12th generation I've found around 840 ancestors so far, and that's 41% of the theoretical maximum (if there wouldn't be inbreeding).

At birth, the human sex-ratio differs; slightly more boys are born than girls. The ‘natural’ sex-ratio at birth is around 103-107 boys per 100 girls. There are biological reasons for this: boys are more susceptible to birth complications, and infectious diseases.
Genealogy is actually even more male-biased, because usually the males owned the properties, so males can sometimes be traced in property records, when church records are missing. Additionally, even in old records, males are sometimes mentioned with a surname, but females not even with a patronymic, rendering it impossible to find their parents. As a result, of my ancestors found in the 13th generation 43% is female, and 57% is male. In the 16th generation it's even worse with 63% males.

My ancestors mostly originate in the provinces of South Holland and North Brabant (mostly in the part that belonged to Holland before 1800) - with a recent increase in the number of ancestors in the province of Utrecht.

The following typically Dutch first names are common among my ancestors: Jan, Cornelis, Willem, Pieter and Adriaan for men, and for women Elisabeth, Adriana and Maria.
My ancestors include two men, Pieter Huigen Blaeck and Crijn Jans Tuck, who both lived around 1700 and married five times.
The ancestors with the longest marriage - 66 years - are Gerrit Maertensen Korver and Neeltje Claessen Bloet who were married on 30 January 1650 in Moordrecht, and Gerrit died at the end 1716. The next longest marriages are the 61-year marriages of my parents, and my father's maternal grandparents.

Composition and Bandwidth of various Generations
Gen	Composition								Bandwidth **
	Men	Women	Total	% 2024	% 2022	% 2020	% 2018*	% 2016	From	Until
G 3	2	2	4	100.0	100.0	100.0	100.0	100.0	1892	1906
G 4	4	4	8	100.0	100.0	100.0	100.0	100.0	1850	1880
G 5	8	8	16	100.0	100.0	100.0	100.0	100.0	1804	1857
G 6	16	16	32	100.0	100.0	100.0	100.0	100.0	1756	1832
G 7	30	30	60	93.8	93.8	93.8	93.8	93.8	1724	1802
G 8	59	59	118	92.2	92.2	92.2	92.2	90.6	1680	1777
G 9	114	113	227	88.7	88.7	89.1	88.3	86.7	1645	1749
G 10	208	202	410	79.9	80.1	79.7	78.7	76.4	1600	1722
G 11	343	317	660	64.5	64.4	61.8	60.8	57.0	1560	1695
G 12	454	394	848	41.4	41.0	38.4	37.3	33.8	1510	1666
G 13	490	372	862	21.0	20.0	18.7	17.9	15.7	1505	1645
G 14	448	312	760	9.3	9.0	7.3	7.1	6.1	1440	1625
G 15	339	223	562	3.4	3.2	2.3	2.0	1.6	1440	1580
G 16	209	124	333	1.0	1.0	0.6	0.6	0.5	1395	1540
G 17	111	58	169	0.3	0.2	0.2	0.2	0.1	1365	1500
G 18	68	36	104	0.1	0.1	0.1	0.1	0.0	1335	1470

     *) The years 2016 and 2020 feature an ancestor score of February; 2018 has an August score; 2022 and 2024 have a January score.
   **) The Bandwidth of a generation is determined by the earliest and latest known birth or baptism date within that generation.
  ***) I have many ancestors in places like Sint Anthoniepolder, 's-Gravendeel, Wieldrecht and Hendrik-Ido-Ambacht, where pre-1800 baptism records are (mostly) missing.

Further Reading: Geneanet's Ancestor Score Definition, Equivalent Complete Generations, Identical Ancestors Point, Coefficient Of Relationship, Gender Ration, Completeness Index.