Consanguinity index calculations?

Just for comparison purposes, Franz Salvator, Erzherzog von Österreich (who married the granddaughter of Franz Karl) is listed with a consanguinity index of 17.48% While it's certainly possible that he has a higher index, it would be interesting to be able to get a more complete comparison between the two of them given the apparent underestimation for Franz Karl.

Franz Salvator's tree is complete to 7 generations, so I've invited the profile to the Complete ancestors trees project.

Inviting some more profiles with high consanguinity indexes and tree completeness:
Ferdinand Karl Viktor, Erzherzog von Österreich-Este
Ferdinand IV, Grand Duke of Tuscany
and Maria Antonietta di Borbone-Due Sicilie, contessa di Caserta (25.69%)

Charles II the bewitched, King of Spain has a very complete tree (already in the project) and also a very high consanguinity index - 26.37% - not surprisingly, since his father married his niece. Even given that, he still has only a few fewer ancestors in 10 generations than Franz Karl.

Meanwhile, Felipe V de España with only a few more ancestors in 10 generations has an index of only 7.76%. In my opinion, the cumulative effects of multiple generations of inbreeding aren't being well accounted for given these wide disparities.

Yes, having the close intermarriages in the generations directly before makes a difference, but I suspect in all of these cases the percentages are on the low side.

I'd find a consanguinity index interesting as well...

Anyone who can explain what a "consanguinity index" is?

I am working on an app which can show all the paths up to an ancestor and would like to know if "consanguinity index" is something useful that can be implemented as well.

Well, in non technical terms it's a percentage which indicates how closely inbred a person or animal is, There are a couple of different methods of calculating this, I'll see if I can dig up some of the links I was looking at yesterday. In the meantime, a general reference explanation can be found at http://en.wikipedia.org/wiki/Consanguinity#Genetic_definitions

Finding multiple paths to the same ancestor would definitely be related to consanguinity, though I'm not certain of how useful the index would be in your app

Different methods for calculating a consanguinity index percentage (or coefficient of inbreeding) http://www.highflyer.supanet.com/coefficient.htm

There is a little program I have used which can calculate the index for everyone in the database.

Cooley! Cool! Jada, Do tell!

Very interesting, Jadra!

I sooooo try not to feel, in any way, shape or form, responsible for who was "doing" who... the past 2000 years or so. lol! I DO so have other modern views, on the subject, as well... but that said, I STILL find it fascinating... because, the more times the same mix as remixed with an altered version of the same mix, only altered... through, whatever else they DID NOT SHARE.... and to be a living culmination of these STRONGER ATTRIBUTES. Stronger then, due to being doubly... and at times... triply introduced... and multiply co- existent, within each individuals personal Blood I.D. ie. DNA- Code.
:-)

http://en.wikipedia.org/wiki/List_of_coupled_cousins

Maria Carolina Augusta Bourbon-Two-Sicilies is an interesting addition to the discussion - her mother's parents were double first cousins and her mother married her uncle. She is listed with a consanguinity index of 22.98% http://thepeerage.com/p11237.htm#i112363

I am running a program and so far she only has 393 diff ancestors (out of possible 2026)

http://www.geni.com/photo/view/376406918790013422?album_type=photos...

Princess Frederica Charlotte of Prussia her parents were double first cousins, her maternal grandmother and paternal grandfather's parents were first cousins and the mother of those two siblings' parents were first cousins. According to the peerage her index % is 15.95

thanks Jadra, very cool to see the wheel version :)

Prince Adalbert of Bavaria (1886–1970) / Adalbert Prinz von Bayern (1886–1970) His parents were first cousins, his mother's parents were double first cousins and his maternal grandmother's parents were uncle and niece. More consanguinous marrieas further back, of course. Though whether the blood relationships hold true for all of this has been questioned by some.

Jadra and living Cooley,
You two ROCK!
;-)
<3 <3

and they are quite the good looking women.... the two burbons. I´m really, fascinated... in a creepy- sort of way. q:o))

sorry, Bourbon-Two-Sicilies

http://www.geni.com/photo/view/6000000004964738859?album_type=photo...
details about ancestrs count in a comment bellow the image

Judy Rice,
Thank you for inviting me to join this project. Because most of my family tree is laced with intermarriage of cousins "Pedigree collapse" is an interest of mine and "implex" is a word that I use daily. I believe that an understanding of pedigree collapse is essential for all genealogists to avoid the illusion that a binary representation, such as the popular image of The World Tree, can accurately depict our real ancestry. I am quite surprised that the concept of pedigree collapse and the calculation of consanguinity index has drawn only 28 comments in this discussion to date and that there has been no comment at all since April of 2013. To nurture people's understanding a starting point might be at the well sourced U.S. Census Bureau's "Historical Estimates of World Population" from 10000 BC to 1950 at https://www.census.gov/population/international/data/worldpop/table... or graphs such as the ones at
https://www.google.ca/search?q=world+population+by+century&amp;sa=X...

My grt grandfather Chief Pierre Thawenrate(Atawenrate) Rice b 1814 was married three times two of his wives were related to him you know when on their marriage cert dispensation granted by the Archbishop of Montreal it is a wonder i turned out normal

My grt grandfather Chief Pierre Thawenrate(Atawenrate) Rice b 1814 was married three times two of his wives were related to him you know when on their marriage cert dispensation granted by the Archbishop of Montreal it is a wonder i turned out normal