23andme discloses right off the bat that it cannot identify German or French ancestry 92% of the time.
Ancestry doesn't seem to be able to discern German ancestry too well either, but it doesn't tell its customers that.
Noted: Yet another reader of this blogger just wrote in and shared her experience. She is 100% German, born in Germany, from a small town, not a big city. Her ancestors are documented in the region she's from for the last 400 years. Several of them were well-known and documented.
Ancestry.com called her ancestry as about 50% Scandinavian, 25% Italian, and 25% generic European. What an epic fail.
How many "white bread" regular Americans, with German ancestry take one of these tests, and misleadingly, their German ancestry is literally wiped away?
We note Germans are America's LARGEST ethnic group, but their ancestry is also often hidden, because German surnames Americanize so well. For example, Kohl becomes Cole; Schmidt becomes Smith, etc.
As an experiment, with our reader's permission, we ran her raw data through Gedmatch. Both MDLP (the Magnus Ducatus Lituaniae Project) and Eurogenes were able to call her likeliest ancestry as German. Dodecad, which specializes in Mediterraneans, was able to call her as German in about half of its tests.
So the question remains:
1. If the amateurs can call German DNA with reasonable regularity, why the heck can't Ancestry.com?
2. If Ancestry.com is so bad at identifying America's biggest ethnic group, why doesn't it do the decent thing and tell people?
Showing posts with label Germans. Show all posts
Showing posts with label Germans. Show all posts
Tuesday, July 18, 2017
Tuesday, October 11, 2016
How DNA Ancestry Testing Works and How Can I Know It's Accurate
When a commercial DNA testing site like Ancestry.com or 23andme or FTDNA tests your DNA, they do not know which snippet came from which of your parents.
For example, if at a given point (a gene, in popular parlance), you have a "C" from your dad and a "T" from you mom (meaning you have brown eyes, but carry the blue-eyes gene), the testing service doesn't know which "letter" came from which parent.
What they then do is try to guess, stringing your DNA out into small chunks or strings of letters.
They then compare these to DNA in their reference database. 23andme's reference database, which is one of the best, if not the best in the world, only has about 11,000 samples in it. To represent the whole world!
So if you have ancestry from a big country (like France or Germany) or a country that has pockets of deep isolation (like Italy), the odds -- that they have someone from your corner of the country, or your little isolated craggy valley in some mountain chain -- are small.
They then compare the little strings of letters and come up with a likelihood that you have ancestry from one of those reference populations.
23andme has the most scientific test in the business, but it gets French/German/Belgian/Dutch/Swiss/Austrian/Luxembourgisch ancestry wrong 92% of the time. It most often shows up as "generic Northwest European." Similarly, 23andme -- the best in the business -- can't identify Italian ancestry 50% of the time. It often shows up incorrectly as Middle Eastern or Generic Southern European.
The moral of this story is to be patient with the science. It's not 100% there yet.
If you have documented ancestry from one region, trust your documents.
If you don't have any cousins from a pool you were identified as, then chances are it was a miscall. (For example, if you have documented Italian ancestry, but it says you are 1/8 Middle Eastern or 1/8 Spanish), then unless you have a known great-grandparent that is 100% such, it's probably a miscall. (This would mean your parent would test as 1/4, by the way).
Finally, there is a series problem with testing sites, particularly FTDNA's, with the issue of timing. If you go back far enough, we are ALL Africans, right? Yet a DNA test telling you that you were African would not be too useful. Do they mean recently or in the past?
Similarly, as has been well-documented, most European ancestry can be broken down into 3 big chunks: ancient hunter gatherers (Ancient Western Europeans, most similar modern population = Lithuanians); ancient farmers (Ancient Near Easterners, most similar modern populations include Greeks, Sardinians, others); and ancient pastoralists/horse rearers (Ancient Eurasian Steppe Dwellers, most similar modern populations include Ukrainians). But the migrations were really, truly all over the place.
Ancient Near Easterners are NOT modern Near Easterners. Ancient hunter gatherers in France are NOT the modern French, etc.
If a test tells you that you have some Near Eastern blood, it often is sensing this ancient signal.
It doesn't do you much good for them to say that 6000 years ago, you had some ancestry in the Near East. Everyone did.
For example, if at a given point (a gene, in popular parlance), you have a "C" from your dad and a "T" from you mom (meaning you have brown eyes, but carry the blue-eyes gene), the testing service doesn't know which "letter" came from which parent.
What they then do is try to guess, stringing your DNA out into small chunks or strings of letters.
They then compare these to DNA in their reference database. 23andme's reference database, which is one of the best, if not the best in the world, only has about 11,000 samples in it. To represent the whole world!
So if you have ancestry from a big country (like France or Germany) or a country that has pockets of deep isolation (like Italy), the odds -- that they have someone from your corner of the country, or your little isolated craggy valley in some mountain chain -- are small.
They then compare the little strings of letters and come up with a likelihood that you have ancestry from one of those reference populations.
23andme has the most scientific test in the business, but it gets French/German/Belgian/Dutch/Swiss/Austrian/Luxembourgisch ancestry wrong 92% of the time. It most often shows up as "generic Northwest European." Similarly, 23andme -- the best in the business -- can't identify Italian ancestry 50% of the time. It often shows up incorrectly as Middle Eastern or Generic Southern European.
The moral of this story is to be patient with the science. It's not 100% there yet.
If you have documented ancestry from one region, trust your documents.
If you don't have any cousins from a pool you were identified as, then chances are it was a miscall. (For example, if you have documented Italian ancestry, but it says you are 1/8 Middle Eastern or 1/8 Spanish), then unless you have a known great-grandparent that is 100% such, it's probably a miscall. (This would mean your parent would test as 1/4, by the way).
Finally, there is a series problem with testing sites, particularly FTDNA's, with the issue of timing. If you go back far enough, we are ALL Africans, right? Yet a DNA test telling you that you were African would not be too useful. Do they mean recently or in the past?
Similarly, as has been well-documented, most European ancestry can be broken down into 3 big chunks: ancient hunter gatherers (Ancient Western Europeans, most similar modern population = Lithuanians); ancient farmers (Ancient Near Easterners, most similar modern populations include Greeks, Sardinians, others); and ancient pastoralists/horse rearers (Ancient Eurasian Steppe Dwellers, most similar modern populations include Ukrainians). But the migrations were really, truly all over the place.
Ancient Near Easterners are NOT modern Near Easterners. Ancient hunter gatherers in France are NOT the modern French, etc.
If a test tells you that you have some Near Eastern blood, it often is sensing this ancient signal.
It doesn't do you much good for them to say that 6000 years ago, you had some ancestry in the Near East. Everyone did.
Subscribe to:
Posts (Atom)